The calculated pH of the given solution 0.015M HCl (aq) is equal to 1.82. Therefore, option (A) is a FALSE statement concerning this HCl solution.
What is pH?The pH of a given solution can be defined as the negative logarithm of hydrogen (H⁺) or hydronium ion concentration. Mathematically, pH is inversely proportional to the concentration of (H⁺) ions.
pH = -log ([H⁺])
In chemistry, pH scale is used to calculate the acidic or basic strength of an aqueous solution. The pH scale exhibits a range from 0 to 14. A low pH (about 1 or 2) is acidic while a pH of 7.0 is neutral and a high pH (12 or 14) is basic.
Given the concentration of HCl aqueous solution= 0.015M
The hydronium ion concentration, [H₃O⁺] = 0.015 M
pH = -log [H₃O⁺] = - log (0.015)
pH = 1.82
As the HCl is strong acid it will completely dissociate and no HCl molecules are left in the solution.
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magnesium carbonate, mgco3, is insoluble. identify the spectator ions when aqueous solutions of sodium carbonate and magnesium chloride are combined.
When sodium carbonate and magnesium chloride are mixed in aqueous solutions, the spectator ions are No3- and Na+.
What spectator ions result when mixing sodium carbonate and magnesium chloride in aqueous solutions?Salt and chloride are the spectator ions. The only insoluble component in this reaction is magnesium carbonate. Both water and a gas compound are not created. This indicates that all other ions are spectator ions and remain in aqueous solutions on both sides of the reaction equation.
What happens when sodium carbonate and magnesium chloride are combined?Magnesium carbonate and sodium chloride are created when sodium carbonate, Na 2CO 3, and magnesium chloride, MgCl 2, react.
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a certain metal forms a soluble nitrate salt mno3. suppose the left half cell of a galvanic cell apparatus is filled with a solution of and the right half cell with a solution of the same substance. electrodes made of are dipped into both solutions and a voltmeter is connected between them. the temperature of the apparatus is held constant at .20.0°C.
Which electrode will be positive? Left of Right
What voltage will the voltmeter show? Assume its positive lead is connected to the positive electrode.
Ans1. Left electrode will be positive because in concentration cell electron moves from lower concentration to higher concentration. Hence right electrode will act as anode and will be negative. Left one will act as cathode and will be positive.
Ans2. For Concentration cell,
Ecell =\frac{-0.0591}{1}\log \frac{0.2}{2} (Since, it involves one electron)
= +0.059 V
~ 60 mV.
A conductor used to make electrical contact with a circuit's nonmetallic components is called an electrode. In electrochemical cells, semiconductors like diodes, and medical equipment, electrode are frequently utilized (see Figure 1). Transfer of electrons takes place at the electrode.
Percentage of concentration: It represents how much solute dissolves in 100 g of solvent. If a solution's concentration is 20%, we know that there are 20 g of solute in every 100 g of solution. As an illustration, a solution is made by mixing 10 g of salt and 70 g of water. by % mass, determine the solution's concentration.
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Pituitary gland hormones secreted
Answer: Growth Hormones.
water was added to destroy any remaining acetic anhydride. what is the produt of water and acetic anhydride?
The product of water and acetic anhydride is acetic acid.
What is acetic acid?
Acetic acid is also known as ethanoic acid, ethylic acid, vinegar acid, and methane carboxylic acid; it has the chemical formula of CH3COOH. It is the second simplest carboxylic acid.
Which chemical reaction involves the reaction of water and acetic anhydride?
Salicylic acid is reacted with an excess of acetic anhydride to produce aspirin. As a catalyst, a small amount of a strong acid is utilized, which speeds up the reaction. With the addition of water, the excess acetic anhydride will be quenched (reacted).
In this reaction, One equivalent of salicylic acid reacts with one equivalent of acetic anhydride to form aspirin. The reaction mixture still contains the residual acetic anhydride. Acetic anhydride is easily hydrolyzed during the work-up process to create acetic acid, which is freely soluble in water. The filtrate from the separation of crude aspirin will contain the leftover acetic anhydride that has been hydrolyzed to acetic acid.
The product of water and acetic anhydride is acetic acid.
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a chemical engineer has determined by measurements that there are 81.2 moles of carbon in a sample of methyl tert-butyl ether. how many moles of oxygen are in the sample? round your answer to 3 significant digits.
It is 194.88 moles of oxygen that the chemical engineer determined in the sample of methyl tert-butyl ether if there are 81.2 moles of carbon
Procedure to calculate moles of oxygenIf C5H12O the formula of methyl tert-butyl ether, it is observed that there are 5 hydrogen atoms for every 12 oxygen atoms
And if each mole contains exactly 6.022 × 10∧23 atoms, according to Avogadro's number, then a simple rule of thumb can determine how many hydrogen atoms are present.
Rule of three1 mole ------------- 6.022 ×10∧23
81.2 moles ----------- x
X = 81.2 x 6.022 140 76×10∧23
x = 488,986 x 10∧23
Once again, by the rule of three, the amount of elementary oxygen particles is determined.
5 H atoms ---------- 12 O atoms
488.986 x ×1023 H ------ x O
X = 488,986 x ×10∧23 x 12 /5
X = 1173.567 x 10∧23
And with the rule of three and Avogadro's number, the number of moles of oxygen is also determined.
Rule of three6.022 ×1023 ------------- 1 mol
1173.567 x 1023----------- x mol
X moles = 1173.567 x 10∧23 x 1 / 6.022 x 10∧23
X = 194.88 moles
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which one of the following is not true? group of answer choices a positron is the antiparticle of a proton beta decay occurs when a neutron changes into a proton and an electron positrons are similar in ionizing power and penetrating power to beta particles an alpha particle is a he2 ion
The following statement is not true is : a positron is the antiparticle of a proton .
The statement that are true is given below :
beta decay occurs when a neutron changes into a proton while emitting an electron.positrons are similar in ionizing power and penetrating power to beta particles .an alpha particle is a He²⁺ ionThe positron also called as antielectron is the antiparticle of an electron. the electric charge of positron is +1 e.
Thus, the statement which is not true is a positron is the antiparticle of a proton because a positron is the antiparticle of the electron.
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a 500-gram mass of iron at 40 degree c is placed into an insulated bucket of 500 grams of water at 20 degree c. estimate the final temperature.
The final temperature is less than 30 degrees.
Mass, in physics, quantitative measure of inertia, an essential property of all dependents. It's far, in effect, the resistance that a frame of count number gives to a change in its speed or position upon the application of pressure. The more the mass of a frame, the smaller the alternate produced with the aid of a carried-out force.
The unit of mass within the worldwide machine of gadgets (SI) is the kilogram, which is defined in terms of Planck's regular, which is described as equal to 6.62607015 × 10−34 joule 2d squared.
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Directed Reading for Key Terms
Content Mastery
Chemical Reactions
Directions: Unscramble the terms in italics to complete the sentences below. Write the terms on the lines provided.
1. A sonoditecimpo reaction is one in which a substance
breaks down into two or more substances.
(TIL
2. A chemical noqituae describes a chemical reaction using
chemical formulas and other symbols.
3. In an ingrocexe reaction, the amount of energy needed to
break the original bonds is less than the energy released
when new bonds form.
4. In a glinse-spladicetnem reaction, one element replaces
another in a compound.
5. A lamcechi reaction is a change in which one or more
substances are converted into new substances.
6. A snteshisy reaction is one in which two or more
substances combine to form another substance.
7. In an icehomextr reaction, the energy given off is primarily
in the form of heat.
8. The kind of reaction energy that requires energy in the
form of heat is called remdothcine.
9. An orhibint ties up a reactant and prevents it from
undergoing the original reaction.
10. The insoluble compound that forms during a double-
displacement reaction is called a treaticipep.
11. When more energy is required to break bonds than to
form new ones, the reaction in called gonderince.
Javisina
12. The numbers that represent the number of units of each
substance taking part in a reaction are called isceffoticen.
cin
13. A chemical reaction that has the same number of elements
labor neaille on both sides of the equation is deblanac.
Copyright © Glencoe/McGraw-Hill, a division of The McGraw-Hill Companies, Inc.
Each of the unscrambled terminologies in italics should be used to complete the sentences as follows;
A decomposition reaction is one in which a substance breaks down into two or more substances.A chemical equation describes a chemical reaction using chemical formulas and other symbols.In an exergonic reaction, the amount of energy needed to break the original bonds is less than the energy released when new bonds form.In a single-displacement reaction, one element replaces another in a compound.A chemical reaction is a change in which one or more substances are converted into new substances.A synthesis reaction is one in which two or more substances combine to form another substance.In an exothermic reaction, the energy given off is primarily in the form of heat.The kind of reaction energy that requires energy in the form of heat is called endothermic.An inhibitor ties up a reactant and prevents it from undergoing the original reaction.The insoluble compound that forms during a double-displacement reaction is called a precipitate.When more energy is required to break bonds than to form new ones, the reaction in called endergonic.The numbers that represent the number of units of each substance taking part in a reaction are called coefficients.A chemical reaction that has the same number of elements on both sides of the equation is balanced.What is a chemical reaction?In Science, a chemical reaction can be defined as a chemical process that involves the continuous transformation and rearrangement of the ionic, atomic or molecular structure of a chemical element by breaking down and forming chemical bonds, in order to produce a new chemical compound while new bonds are formed.
What are the types of chemical reactions?Based on changes in chemical structure, there are five (5) main types of chemical reaction and these include the following;
Double-displacement chemical reaction.Decomposition chemical reaction.Combination chemical reaction.Combustion chemical reaction.Single-displacement chemical reaction.Read more on Single-displacement reaction here: https://brainly.com/question/3172917
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what was the solid material left in the test tube at the end of the chemical reaction? explain how this makes sense
The Products are the chemicals that emerge from the process.
What is chemical reaction?
A method where one or more substances, known as reactants, are transformed into one or more new substances, known as products. Substances are made of chemical building blocks or chemical compounds.
What is solid ?
As one of the four fundamental states of matter, a substance is said to be in the solid state when it is in that condition. Atoms in solids are closely packed together and have significantly lower kinetic energy than those in liquids and gases.
Chemical reactions are initiated by reactants, which are the substances that do so. Products are the chemicals that emerge from the process.
Therefore, Products are the chemicals that emerge from the process.
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105 ml of water was added to 40.0 ml of 0.550 m mgcl₂ solution. assuming the volumes are additive, what is the mgcl₂ concentration in the diluted solution?
If volumes are additive and the concentration is determined by molarity, the concentration of the diluted solution of magnesium chloride is 0.152M.
Molar concentration is defined.A measurement used to determine the concentration of chemical compounds in a solution is called molar concentration. It is defined with specific reference to the amount of solute in a solution. The most popular unit for measuring molar concentration is moles/liter.
The formula for calculating molar concentration is mass/molar mass divided by the volume of solution in liters.
Molar concentration is defined as the number of moles divided by the volume of the solution in liters when expressed in terms of moles.
Substitution in the formula is required if the volumes are additive.
M₁V₁=M₂V₂
M₂ = 0.550 ×40/145
M₂ = 0.152M.
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l cells are a particular type of electrochemical cell that require a constant source of chemical fuels, or reactants, during operation. one of the most common types of fuel cells is the alkaline fuel cell, which uses hydrogen and oxygen as reactants. what species are formed at the anode of the alkaline fuel cell? h2 o2 e− oh− h2o h what species are formed at the cathode of the alkaline fuel cell? h2o e− oh− h2 h o2
Water molecules are the species that also are created on this end of the cell. The total reaction is referred to as a redox reaction.
Explain what electrochemical means.The research of the correlation of electrical electricity and chemical reactions is the focus of the branch of chemistry known as electrochemistry. Oxidation process are those in which electric currents are either generated or received.
What are some electrochemical examples?The typical 1.5-volt cell, which powers numerous electrical devices like TV remote controls and clocks, is an illustration of an electrochemical cell. Copper ions or pv cells are those that may produce an electric current as a consequence of chemical reactions taking place inside of them.
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. suppose 32.8 g of hydrochloric acid is mixed with 9.7 g of sodium hydroxide. calculate the maximum mass of water that could be produced by the chemical reaction. round your answer to 2
The maximum mass of NaCl that could be produced by chemical reaction is 14.03grams
What is Stoichiometry?
Stoichiometry is a branch of chemistry that includes determining desired quantitative data by exploiting relationships between reactants and/or products in a chemical process.
Stoichiometric challenges are grouped into various types: Mass to mass conversion. Mass to moles conversion. Mole to mass steps conversion.
What is limiting agent?
The limiting reagent is the reactant that is totally consumed in a reaction, determining when the reaction comes to a halt. The exact amount of reactant required to react with another element can be estimated using reaction stoichiometry.
Given,
Mass of hydrochloric acid = 32.8 grams
Molar mass of hydrochloric acid (HCl)= 36.46 g/mol
Mass of sodium hydroxide = 9.7 grams
Molar mass of sodium hydroxide = 40.0 g/mol
According to the question, equation would be :
[tex]HCl + NaOH[/tex] → [tex]NaCl + H_2O[/tex]
moles of HCl = Given mass of HCl / Molar mass of HCl
moles of HCl = 32.8 / 36.46 = 0.899 ≅ 0.90moles
moles of NaOH = Given mass of NaOH / Molar mass of NaOH
moles of NaOH = 9.7 / 40.0 = 0.242 ≅ 0.24moles
Here, NaOH is a limiting factor, so it will be consumed completely. But moles of HCl are in excess.
So, only 0.24moles of HCl will be consume and remaining will be 0.90moles - 0.24moles = 0.66moles.
When 1 mol HCl react with 1 mol NaOH it produce 1 mol NaCl and 1 mol [tex]H_2O[/tex]
For 0.24moles of NaOH, we will have 0.24moles of NaCl
Maximum mass of NaCl = no. of moles of NaCl * molar mass of NaCl
mass of NaCl = 0.24 * 58.44 = 14.0256 ≅14.03grams
mass of NaCl ≅14.03grams
The maximum mass of NaCl that could be produced by chemical reaction is 14.03grams
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if 6.506.50 l of water vapor at 50.2 °c50.2 °c and 0.1210.121 atm reacts with excess iron, how many grams of iron(iii) oxide will be produced? 2fe(s) 3h2o(g)⟶fe2o3(s) 3h2(g)
1.57g of iron(iii) oxide will be produced.
What do you mean by ideal gas equation?
The Ideal gas law is the equation of state of a hypothetical ideal gas. It is a good approximation to the behaviour of many gases under many conditions, although it has several limitations. The ideal gas equation can be written as
PV = nRT
Where,
P is the pressure of the ideal gas.
V is the volume of the ideal gas.
n is the amount of ideal gas measured in terms of moles.
R is the universal gas constant.
T is the temperature.
V = 6.50 L
T = 50.2 degree celsius = 50.2 + 273.15 K = 323.35 K
P = 0.121 atm
Using ideal gas equation,
n = PV/ RT = 0.121 atm* 6.50 L / 0.0821 * 323.35 K = 0.0296 mol
0.0296 mol of H20* 1mol Fe2O3 / 3mol H2O * 159.69g of Fe2O3/1 mol Fe2O3= 1.57g
So, 1.57g of iron(iii) oxide will be produced.
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Iron and oxygen react to form iron(III) oxide; 4Fe(s)+3O2(g)-->2Fe2O3(s). Determine the limiting reactant in each of the following mixtures of reactants: a) 2.0 mol of Fe and 6.0 mol of O2. b) 5.0 mol of Fe and 4.0 mol of O2. c) 16.0 mol of Fe and 20.0 mol of O2. express your answer as a chemical formula.
The limiting reagent in all the three mixtures a, b and c is Iron.
Iron and Oxygen reacts with each other to form iron (III) as follows,
4Fe(s) + 3O₂(g) → 2Fe₂O₃(s)
So, as we can see,
4 moles of Fe reacts with moles of O₂ to form iron(III) oxide.
So, for every 1 mole of Fe, 3/4 moles of O₂ will required.
Also,
Moles = Given mass/Molar Mass
Molar mass of Fe = 55 g/mol.
Molar mass of Oxygen = 16 g/mol.
a). In mixture of 2.0 mol of Fe and 6.0 mol of O₂,
There are 3 moles of O₂ are present for every one mole of Fe.
So, Fe is the limiting reagent here.
b) In mixture of 5.0 mol of Fe and 4.0 mol of O₂,
4/5 moles of O₂ are present for one mole of O₂.
So, the limiting reagent in this case is Iron.
c) In mixture of 16.0 mol of Fe and 20.0 mol of O₂,
There are 16/20 moles of O₂ are present for one mole of Iron.
So, the Limiting reagent in this case is Iron.
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if liquid ammonia and water were mixed, between which two atoms in these molecules would a hydrogen bond form?
For modest atomic masses, the atom's recoil plays a more significant role. Which two atoms in these molecules would be interconnected if liquid ammonia and water were combined?
What is a hydrogen bond, for instance?
Hydrogen, for instance, is covalently linked to the more electronegative oxygen atom in water molecules (H2O). Therefore, the dipole-dipole interactions between the hydrogen atom of one water molecule and the oxygen atom of another H2O molecule are what cause hydrogen bonding to form in water molecules.
What exactly does the term "hydrogen bond" mean?
The partial positive charge of the hydrogen atoms in some polar molecules causes them to be drawn to the partial negative charge of an atom in another neighboring molecule. A hydrogen bond is the name given to this attraction.
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write the balanced net ionic equation for the reactions that occur when the given aqueous solutions are mixed. include the physical states. a. nitric acid, hno3 , and calcium hydroxide, ca(oh)2
Calcium hydroxide, or Ca(OH)2(aq), has the ability to neutralize nitric acid, or HNO3(aq). When these two compounds react, what salt is produced? Write a balanced chemical equation to describe the reaction.
HNO3 (aq) + NaOH (aq) H 2 O (aq) + NaNO3 In this reaction, sodium hydroxide, a base, and nitric acid, an acid, combine to produce sodium nitrate, a salt, and water. It is, therefore, a neutralization reaction. Consequently, the chemical reaction that is balanced is 2 KClO 3 Chlorate of potassium 2 KCl Potassium chloride + 3 O2 the element of oxygen.
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Which set of compounds is arranged in order of increasing magnitude of lattice energy?.
The compounds MgO, NaF, and RbI are organized in ascending order of lattice energy.
Which substance possesses the largest lattice energy?Smaller ions have bigger charges, which results in more lattice energy. thus possesses the highest lattice energy.
Which lattice energy order is correct?Radius of the ions has an inverse relationship with lattice energy. Magnesium ions are smaller than calcium ions in size. As a result, lithium fluoride has the lowest lattice energy and magnesium oxide has the greatest.
What boosts the lattice's energy?Lattice energy increases for ions with higher charges and shorter distances between ions. Lattice energies are often calculated using the Born-Haber cycle, a thermochemical cycle including all of the energetic steps involved in converting elements into an ionic
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what is used in an acid-base titration to indicate the right amount of titrant has been added to an aliquot of the analyte to completely neutralize it
In an acid-base titration, an indicator is typically used to indicate the endpoint of the titration.
An indicator is a chemical that changes color when a certain pH is reached, usually near the equivalence point of the titration. Common indicators used in acid-base titrations include phenolphthalein, methyl orange, and bromophenol blue.
The indicator is typically added to the analyte solution at the beginning of the titration. When the titrant is added to the analyte, the pH of the solution will gradually increase.
When the amount of titrant added is equal to the amount of analyte, the solution will be neutralized, and the endpoint of the titration (the equivalence point) will be reached. At this point, the indicator will change color, indicating that the titration is complete.
The color change indicates the end point of the titration, and the amount of titrant added is equal to the amount of analyte.
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many covalent compounds are gases, liquids, or low-melting solids at room temperature. which option correctly accounts for this behavior? multiple choice question.
Covalent compounds are gases, liquids, or low-melting solids at room temperature because intermolecular forces between the molecules require little energy to break.
An electron exchange that results in the formation of electron pairs between atoms is known as a covalent bond. Bonding pairs or sharing pairs are the names given to these electron pairs. Covalent bonding is the stable equilibrium of the attractive and repulsive forces between atoms when they share electrons.
Covalent compounds can be found as soft solids, liquids, or gases.Generally speaking, covalent compounds have low melting and boiling points.Covalent compounds are soluble in organic solvents but insoluble in water.They don't conduct electricity when they're solid, molten, or liquid.For more questions like Covalent compounds click the link below;
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what volume (in ml) of water must you add to 50.0 ml of a 0.600 m libr solution to produce a 0.145 m solution? assume the volumes are additive.
To neutralize 23.5 mL of a 0.145 M barium hydroxide solution, 23.9 mL of a 0.284 M hydrochloric acid solution is needed.
What does barium hydroxide serve?
Barium hydroxide is used to titrate weak acids, especially organic acids, in analytical chemistry. In contrast to the alkali hydroxides, barium carbonate creates clear, carbonate-free aqueous solutions because it is insoluble in water.
Acidity of barium hydroxide
When heated to 800 °C, barium hydroxide turns into barium oxide. Barium carbonate is produced when carbon dioxide reacts with it. Its strong base causes its extremely alkaline aqueous solution to go through neutralization reactions with acids.
Briefing:
The equation is given as:
Ba(OH)₂ + 2HCl ------> BaCl₂ + 2H₂O
from the equation it is clear that :
1mole of Ba(OH)₂ = 1 mole of HCl
number of moles of Ba(OH)₂ = volume × Molarity
= 0.0235 × 0.145
= 0.0034 mol
Therefore, number of moles of HCl = 2× 0.0034 mol = 0.0068 mol
volue of HCl = moles / Molarity
= 0.0068 / 0.284
= 0.0239 L = 23.9 mL
Thus, The volume of a 0.284 M hydrochloric acid solution is required to neutralize 23.5 mL of a 0.145 M barium hydroxide solution is 23.9 mL.
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identify the substitution product that is expected when 1-bromo-1-methylcyclohexane undergoes an sn1 reaction in the presence of water.
A tertiary cyclohaloalkane is 1-bromo-1-methylcyclohexane. This indicates that it hinders carbon-1 sterically. As a result, committing to SN1 is more likely than SN2.
Describe carbon.
The number of protons six and letter C are attributed to the chemical element carbon. Four of its four available electrons can be used to create covalent chemical connections because it is a nonmetallic, tetravalent atom. The periodic table's group 14 includes it. Just 0.025 percent of the carbon on Earth is found in its crust.
What uses does carbon serve?
Coal, toxic gases, and crude oil are all utilized as fuel in it. It is employed to create a wide range of products, including polymers and steel alloys. Even black ink for printing or painting is produced with it.
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2nahco3 --> h2o (gas) co2 (gas) na2co3 (solid) how many l of gas are produced if 1.00 g. of nahco3 decomposes at 29 degrees c and 769 torr?
0.375 L of gas are produced if 1.00 g. of nahco3 decomposes at 29 degrees c and 769 torr
From the question, we have
moles=0.011
p=769 torr
v=?
temperature=302K
PV=nRT
V=nRT/P
V=0.11×8.3×302÷769
V=0.375 L
Volume :
The area occupied within an object's limits determines its volume in three dimensions. On occasion, it is referred to as the object's capacity. The volume of an object can be used to calculate how much is needed to fill it; for instance, how much water is needed to fill a bottle, aquarium, or water tank. A sphere is the most basic and prevalent type of three-dimensional shape. We come with spheres all the time in the form of balls, globes, ornamental lights, oranges, etc.
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The solution for bounded buffer problem provided in section 7. 1. 1 does not work correctly if there are more than one producer or consumer.
a. True
b. False
The following assertion is true , If there are several suppliers or customers, the solution for the bounded buffer problems mentioned in section 7. 1. 1 will not function properly.
What is solution explain?A mixture is any mixture in which one or more solutes have been broken down by a solvent. Solutes must dissolve in solvents to form homogeneous mixtures. Solutes must dissolve in solvents to form homogeneous mixtures.
What are 4 examples of a solution?Types such solution include sugar-water, salt solutions, metal, alloy, alcohol in water, aerosols, air, and aerated beverages like Coca-Cola. When working with chemicals, we frequently make a variety of solutions, such copper in water and iodine in alcohol, among others.
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hydrocarbon gas is 81.7% c and the rest hydrogen by mass. at a temperature of 25°c and a pressure of 1atm, 1.28 g of this gas occupies 0.714 l. what is the molecular formula?
So the formula is C2H4, hydrocarbon gas is 81.7% c and the rest hydrogen by mass. at a temperature of 25°c and a pressure of 1atm, 1.28 g of this gas occupies 0.714 l.
Purely made of carbon and hydrogen, hydrocarbons are by far the most prevalent substance in crude oil, refined petroleum hydrocarbons (such as gasoline, diesel, kerosene, fuel oil, and lubricating oil), coal tar, creosote, dyestuff, and pyrolysis waste products. The most fundamental class of organic molecules are referred to as hydrocarbons. They only contain the two elements hydrogen and carbon, as implied by their name. In a branching or chain-like arrangement, hydrogen atoms surround one or more central carbon atoms in hydrocarbon molecule.
Carbon : Hydrogen mole ratio = 12
85.7 :14.3= 7 : 14 = 1 : 2
Empirical formula = C H : empirical formula wt = 14
Given 1 litre at NTP weighs 1.26 g
Therefore 22.4 litres will weigh = 28 g
n = 14, so the formula is C2H4
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provide a reason to explain why the less stable radical intermediate leads to the formation of the major product in this reaction.
A radical, also known as a free radical, is an atom, molecule, or ion that has at least one unpaired valence electron.With some exceptions, these unpaired electrons make radicals highly chemically reactive.Organic radicals are stabilized by any or all of these factors: presence of electronegativity, delocalization, and steric hindrance.Organic radicals are inherently electron deficient thus the greater the electronegativity of the atom on which the unpaired electron resides the less stable the radical.Organic radicals are inherently electron deficient thus the greater the electronegativity of the atom on which the unpaired electron resides the less stable the radical.The greater the steric hindrance the more difficult it is for reactions to take place, and the radical form is favored by default.
The least stable radical is methyl radicals
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What energy is associated with a photon in the infrared region of the spectrum having a frequency of 2.9 × 1013 5-1?
Answer:
1.9 x 10^-20 Joules
Explanation:
I'll assume the frequency is 2.9 x 10^13 Hz [5-1 was meant to be s^-1].
The energy of a photon is given by the releationship:
E = hf, where E is energy, h is Planck's constant, and f is frequency, in 1/s or Hz.
Planck's constant = 6.62607E-34 J*s
E = hf
E = (6.626 x 10^-34 J*s)*(2.9 x 10^13 s^-1)
E = 1.9 x 10^-20 Joules
A chunk of dry ice, solid co2, disappears after sitting at room temperature for a while. There is no puddle of liquid. What happened?.
At room temperature, a chunk of dry ice, which is solid CO2, eventually disappears. No liquid puddle is present. The CO2 gas froze solid.
Dry ice is created when carbon dioxide freezes. Instead of first becoming a liquid and then a solid, carbon dioxide transitions directly from a gas to a solid. Because of this, anytime it melts, gas is also produced.
What does dry ice actually serve for?
Dry ice is typically used in industry for operations including blasting, maintaining frozen items, and conveying medications. Additionally, we regularly use dry ice for a number of additional purposes, such as creating spectacular effects for films and events.
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two gases are in a sealed 3.17 l flask. if you have 17.81 grams of ne and 18.81 grams of ar, what is the mole fraction of ar? give your answer in the correct number of significant figures.
two gases are in a sealed 3.17 l flask. if you have 17.81 grams of ne and 18.81 grams of ar, the mole fraction of ar is 45.76
How to solve ?molar mass of ne = 20.18/mole
17.81 / 20.18 = 0.882 moles
molar mass of ar = 39.948/mole
18.81 / 39.948 = 0.470 moles
molar fraction of Ar = 39.948 / 0.882 + 0.470
= 45.76
Formula Related to the Mole Fraction ?Consider a solution that consists of two substances A and B, then the mole fraction of each substance is:Mole fraction of solute = (Moles of Solute) / (Total number of moles of the solutes and the solvent).= XA = (mol A) / ( mol A + mol B)And= XB = (mol B) / ( mol A + mol B).
What are the Properties of Mole Fraction ?Because it is temperature independent, it is not affected by changes in temperature. In the case of the mole fraction, it is not required to be aware of the densities of the relevant phases. A mixture with a known mole fraction can be made by subtracting the actual masses of the elements from the total weight. The measure is symmetrical, therefore the roles of "solvent" and "solute" are switched in the mole fractions where x = 0.1 and x = 0.9. A component's mole fraction in a ternary mixture can be stated as a function of the binary mole ratios and mole fractions of the other components.
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what mass of fe2o3 is produced when 27.2 l of o2 gas react with fes at 452 k and 3.86 atm. 4fes(s) 7o2(g)⟶2fe2o3(s) 4so2(g) first, use the ideal gas equation to calculate the moles of o2. ????
Using the ideal gas equation, the number of mole of O₂ is 2.83 mol.
What is the ideal gas equation?PV = nRT is the formula for the ideal gas equation. In this equation, P denotes the ideal gas's pressure, V the volume of the ideal gas, n the total amount of ideal gas measured in moles, R the universal gas constant, and T the temperature.
The reaction becomes:
4 FeS (s) + 7O₂ (g) → 2Fe₂O₃ (s) + 4SO₂ (g) .
Volume of O₂ = 27.2 L .
Pressure = 3.86 atm.
Temperature = 452 K .
We have to calculate what mass of Fe₂O₃ will be produced from the given starting material.
We know that,
According to Ideal gas law,
PV = nRT
Where ,
P is pressure
V is volume
n is number of mole.
R is gas constant.
T is temperature.
Now putting the values,
3.86 atm x 27.2 L = n x (0.0821 L.atm/ mol.K) x 452 K
n = 2.83 mol.
So the number of mole of O₂ is 2.83 mol.
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Use the information and examples provided in the exploration and the values recorded in data table 1 from step 8 to determine how many moles of na2co3 are necessary to reach stoichiometric quantities. From that calculation, determine how many grams of na2co3 are necessary to reach stoichiometric quantities. Record both values in data table 1.
0.0102 moles Na₂CO₃ is 1.08g of Na₂CO₃ are necessaries .
Define Stoichiometry .
The quantitative study of the reactants and products involved in a chemical reaction .
What is a mole ?
A standard scientific unit for measuring large quantities of very small entities such as atoms, molecules, or other specified particles.
How to calculate the molecular weight of a given compound ?
Count the number of atoms of each element, and then multiply that number by the element's atomic weight.
Based on the reaction :
CaCl₂ + Na₂CO₃ → 2NaCl + CaCO₃
1 mole of CaCl₂ reacts per mole of Na₂CO₃
Further we are suppose to calculate number of moles of CaCl2•2H2O present in 1.50 g.
To solve this question we must find the moles of CaCl2•2H2O using its molar mass (147.0146g/mol).
No. of moles = Moles CaCl₂ = Moles of Na₂CO₃ necessaries to reach stoichiometric quantities.
Then find then the mass we must use molar mass of Na₂CO₃ (105.99g/mol):
Moles CaCl₂.2H₂O:
1.50g * (1mol / 147.0146g) = 0.0102 moles CaCl₂.2H₂O = 0.0102moles CaCl₂
Moles Na₂CO₃:
0.0102 moles Na₂CO₃
Mass Na₂CO₃:
0.0102 moles * (105.99g / mol) =
1.08g of Na₂CO₃ are present
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