Answer:
172.48gExplanation:
CH4 + 2O2 ---> CO2 + 2H2O
moles of methane = 62.8/16 = 3.92
by stotiometry,
3.92 = n
thus mass of co2 = moles× molar mass = 3.92 × ( 12 + 32)
3.92× 44 = 172.48 gramsAn aqueous solution is produced by dissolving 1.5 g of barium hydroxide (Ba(OH)2(aq) in enough water
to make 0.250 L.
a) write the dissociation reaction of barium hydroxide
b) calculate the molar concentration of OH(aq)
13
c) calculate pH
Answer:
A. Ba(OH)₂ (aq) <==> Ba²⁺ (aq) + 2OH¯ (aq)
B. The molar concentration of OH¯ is 0.072 M
C. The pH of the solution is 12.86
Explanation:
A. Dissociation equation
Barium hydroxide Ba(OH)₂ dissolves in water by the following equation:
Ba(OH)₂ (aq) <==> Ba²⁺ (aq) + 2OH¯ (aq)
B. Determination of the molar concentration of OH¯.
We'll begin by calculating the number of mole in 1.5 g of Ba(OH)₂. This can be obtained as follow:
Mass of Ba(OH)₂ = 1.5 g
Molar mass of Ba(OH)₂ = 137 + 2(16 + 1)
= 137 + 2(17)
= 137 + 34
= 171 g/mol
Mole of Ba(OH)₂ =?
Mole = mass / Molar mass
Mole of Ba(OH)₂ = 1.5 / 171
Mole of Ba(OH)₂ = 0.009 mole
Next, we shall determine the molarity of Ba(OH)₂. This can be obtained as follow:
Mole of Ba(OH)₂ = 0.009 mole
Volume of solution = 0.250 L
Molarity of Ba(OH)₂ =?
Molarity = mole / Volume
Molarity of Ba(OH)₂ = 0.009 / 0.250
Molarity of Ba(OH)₂ = 0.036 M
Finally, we shall determine the molar concentration of OH¯.this can be obtained as follow:
Ba(OH)₂ (aq) <==> Ba²⁺ (aq) + 2OH¯ (aq)
From the balanced equation above,
1 mole of Ba(OH)₂ produced 2 moles OH¯.
Therefore, 0.036 M Ba(OH)₂ will produce = 0.036 × 2 = 0.072 M OH¯.
Therefore, the molar concentration of OH¯ is 0.072 M
C. Determination of the pH.
We'll begin by calculating the pOH of the solution. This can be obtained as follow:
Concentration of OH¯, [OH¯] = 0.072 M
pOH =?
pOH = –Log [OH¯]
pOH = –Log 0.072
pOH = 1.14
Finally, we shall determine the pH. This can be obtained as follow:
pOH = 1.14
pH =?
pH + pOH = 14
pH + 1.14 = 14
Collect like terms
pH = 14 – 1.14
pH = 12.86
What type of chemical reaction is this?
Al(OH)3 → Al2O3 + H20
Answer:
The given equation [tex]Al(OH)_3[/tex] →[tex]Al_2O_3+H_2O[/tex] is the type of decomposition reaction.
Explanation:
DECOMPOSITION REACTION-: A decomposition reaction occurs when a single compound decomposes into two or more elements or new compounds. These reactions take place when energy is supplied in the form of heat, electricity, or light, which allows the material to break down into simpler substances.
The most common form of decomposition reaction is -
[tex]AB[/tex] → [tex]A+B[/tex]
TYPES OF DECOMPOSITION REACTION IS -
THERMAL DECOMPOSITION REACTION -: Thermolysis, or thermal decomposition, is a chemical decomposition caused by heat. The temperature at which a material chemically decomposes is known as its decomposition temperature. Heat is needed to sever chemical bonds in the compound being decomposed, so the reaction is normally endothermic.Example- As calcium carbonate (limestone or chalk) is heated, it breaks down into calcium oxide and carbon dioxide. The following is the chemical reaction:
[tex]CaCO_3[/tex] →[tex]CaO+CO_2[/tex]
ELECTROLYTIC DECOMPOSITION REACTION -: An electrolytic reaction is a chemical reaction in which electricity is passed through the aqueous solution of the reactant, resulting in the breakdown of the reactant into the substance.Example -: When electricity is passed through an aqueous solution of sodium chlorine (NaCl), sodium and chlorine are created.
NaCl → Na + Cl
PHOTOLYTIC DECOMPOSITION REACTION -: Light or photons are used to break down the reactants into many components in this form of reaction. The photo decomposition reaction is the decomposition reaction that occurs as a result of the action of light. Photolysis is another name for these reactions. In these reactions, light absorption excites electrons, which causes bonds to break and products to form.Example - As silver chloride is exposed to light, it decomposes into silver metal and chlorine.
[tex]2AgCl[/tex] →[tex]2Ag+Cl_2[/tex]
Observe this chemical reaction:
4 Fe + 302- 2Fe 203
How many atoms of oxygen are in this !
Answer:
There are 6 atoms of oxygen
Explanation:
The total oxygen used here is represented as molecule. One molecule of oxygen as two atoms.
In this chemical equation, total three oxygen molecule reacts with the iron.
Hence, total number of atoms in 3 molecules of oxygen with two oxygen per molecule = [tex]3 * 2 = 6[/tex]
There are 6 atoms of oxygen
I NEED HELP ASAP PLEASE GIVING BRAINLIEST!
Answer: Frequency
Explanation: Without a doubt my answer is Frequency, none of the other options have nothing to do with sound waves so Frequency is my best bet.
Which of the following represents the atomic number of an element?
Answer:
The atomic number is the number of protons in the nucleus
The kinetic energy of a gas particle can be transferred to another gas particle or to the wall of the container in a collision.
True or False
Answer:
True
Explanation:
How many atoms are in 7.2 MOL of Chlorine?
Answer:
7.2 mol * (6.02*10^23)= 4.3*10^24 atoms
Explanation:
The number of atoms in one mole of chlorine contains 6.022 × 10²³ . Therefore the number of Cl atoms in 7.2 moles is 4.3 × 10²⁴.
What is Avogadro number ?One mole of every substance contains 6.022 × 10²³ atoms. This number is called Avogadro number. One mole of every elements contains Avogadro number of atoms.
Chlorine is 17th element in periodic table. Cl is a non-metal with high electronegativity. The atomic mass of Cl is 35.5 g. Thus, 35.5 g contains Avogadro number of Cl atoms.
One mole of Cl contains 6.022 × 10²³ atoms. Tus, number of atoms in 7.2 mol is Avogadro number times the number of moles.
no.of atoms = 6.022 × 10²³ × 7.2 = 4.3 × 10²⁴ atoms.
Therefore, 7.2 moles of Cl contains 4.3 × 10²⁴ atoms.
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What is happening to the particles in a substance during evaporation?
O The particles are losing energy and slowing down.
O The particles are giving off light.
O The particles are gaining energy and speeding up.
O The particles are getting closer together.
Answer:
C
Evaporation happens when a liquid substance becomes a gas. When water is heated, it evaporates. The molecules move and vibrate so quickly that they escape into the atmosphere as molecules of water vapor.
Investigating the Molecular Scale
Answer:
nice
Explanation:
how is it
Which of the following statements best explains why the atomic radius increases from top to bottom of the periodic table? A. The electronegativity decreases from top to bottom of the periodic table, so the atoms near the bottom have an increased capacity for electrons. B. For the atoms lower in the periodic table, there is more difference in charge between the electrons and the protons, which allows electrons to orbit farther from nucleus. C. The ionization energy decreases from top to bottom of the periodic table, so the atoms near the bottom have an increased capacity for electrons. D. For the atoms lower in the periodic table, the valence electrons are in higher energy levels and farther from the nucleus.
Answer:
D. For the atoms lower in the periodic table, the valence electrons are in higher energy levels and farther from the nucleus.
Explanation:
Atomic radius increases down the group because down the group, there an increase in the number of principle energy levels occupied. Now, these higher principal energy levels are made up of orbitals that are larger than the orbitals from the lower energy levels in size.
Therefore, the effect of this is that the greater number of principal energy levels will outweigh the increase in nuclear charge since nuclear charge also increases down the group and this in turn makes the atomic radius to increase as we go down the group.
Answer: C. For the atoms lower in the periodic table, the balance electrons are in higher energy levels and farther from the nucleus.
Explanation: As the valance electrons orbit farther from the nucleus the energy level increases from the top to the bottom of the periodic table. So the atoms lower in the periodic table, the balance electrons are in higher energy levels and farther from the nucleus, which result in an increase in the atomic radius.
According to the selection, what is the main weakness of the tortoise?
Answer:
Nose
Explanation:
Because every time I touch it's nose, it will hide itself into the shell faster than other places
Hi!the main weakness of the tortoise is it's shell.The most shell of tortoise are so hard that most animals can't even make a scratch on it But flip one over and getting up will be a huge problem. They can suffer from dehydration or get picked off by predators. And even though reptiles are sun loving, they still can't regulate their body temperature and this could lead to over heating and death.
thermal energy lab report
What is distillation
Answer:
Definition:
1. The action of purifying a liquid by a process of heating and cooling.
2. The extraction of the essential meaning or most important aspects of something.
Explanation:
Answer:
the action of purifying a liquid by a process of heating and a process of cooling.
Explanation:
look at the answer.
Which of the following is an empirical formula? a) H2O2 b) H2O c) C2H2 d) C4H8
Answer:
The correct answer is h20
Explanation:
i got it right on an exam.
a. on the right with the long wavelengths
b. in the middle
c. on the left with the short wavelengths
d. we can see the whole thing
:)
Answer:
b. in the middle
Explanation:
your answer choice is correct!
Which equation represents a redox reaction?
A. HCI + LiOH
-
LiCl + H20
B. AgNO3 + LICI
AgCl + LINO3
C. HNO3 + KOH - KCl + H20
D. 2NaBr + Cl2
-
2NaCl + Br2
SUBI
Answer:
D. [tex]2NaBr + Cl_2\rightarrow 2NaCl + Br_2[/tex]
Explanation:
Hello!
In this case, for the given set of chemical reactions, it is possible to infer that D. is a categorized as redox due to the following:
Since both chlorine and bromine remain as diatomic gases, their oxidation states in such a form is 0, but as anions with lithium cations they have a charge of - according to the following reaction and half-reactions:
[tex]2NaBr + Cl_2\rightarrow 2NaCl + Br_2[/tex]
[tex]Cl_2^0+2e^-\rightarrow 2Cl ^-\\\\2Br^- \rightarrow Br_2^0+2e^-[/tex]
Unlike the other reactions whereas no change in the oxidation states is evidenced.
Answer:
D. 2NaBr + Cl2
Some birds migrate 20,000 miles. If 1 mile is 1.6 kilometers, calculate the distance these birds fly in kilometers.
Answer:
32000 kilometers
Explanation:
In order to convert from miles to kilometers, we need to use a conversion factor. In other words, we put miles in the denominator and kilometers in the numerator, as follows:
20000 miles * [tex]\frac{1.6km}{1mile}[/tex] = 32000 kilometersThat way the units for miles cancel each other, leaving the equivalent amount in kilometers.
properties of lithium are anomalous. justify this statement
Answer:
Lithium shows anomalous behavior due to its small size. The polarizing power of lithium ion is highest of all the alkali metal ion . Because of small size, Lithium is very hard, less reactive as compare to other alkali metals like sodium and potassium.
Hope this helps:)
Balancing the following chemical equation, and determine its reaction type.
LiCl +
[Br₂ -
LiBr +
_CI2
Answer:
[tex]2LiCl +Br_2 \rightarrow 2LiBr +Cl_2[/tex]
Single displacement reaction.
Explanation:
Hello!
In this case, by firstly rearranging the chemical reaction as shown below:
[tex]LiCl +Br_2 \rightarrow LiBr +Cl_2[/tex]
It is also necessary to balance it at follows:
[tex]2LiCl +Br_2 \rightarrow 2LiBr +Cl_2[/tex]
Thus, since bromine and chlorine are being exchanged as a result of the atoms rearrangement, we infer this is a single displacement reaction.
Best regards!
3. Which of the following statements best describes friction?
a. It is a force that occurs between solids.
b. It is a force that occurs only on rough surfaces.
c. It is a force that occurs between solids and liquids.
d. It is a force that occurs when surfaces touch each other.
pls help
Answer:
d.
Explanation:
It is a force that occurs when surfaces touch each other.
Calculate the mass, in grams, of 992 atoms of cesium, Cs (1 mol of
Cs has a mass of 132.91 g).
Answer:
[tex]2.19x10^{-19}gCs[/tex]
Explanation:
Hello there!
In this case, it is possible to know that the amount of atoms of cesium are related to moles by means of the Avogadro's number, for that reason we first compute the moles in 992 atoms of this element:
[tex]992atomsCs*\frac{1molCs}{6.022x10^{23}atomsCs}=1.65x10^{-21}molCs[/tex]
Next, given its molar mass, we can compute the mass:
[tex]1.65x10^{-21}molCs*\frac{132.91gCs}{1molCs}\\\\2.19x10^{-19}gCs[/tex]
Best regards!
How many oxygen atoms are there in 979 g Ba3(AsO4)2?
Answer:
2
Explanation:
75.0 g of ammonium sulfate
The octet rule states that atoms tend to gain, lose, or share electrons in order to acquire a full
set of valence electrons. Which type of model could be used to demonstrate this process?
Explanation:
The octet rule states that atoms tend to form compounds in ways that give them eight valence electrons and thus the electron configuration of a noble gas. ... Atoms of nonmetals tend to gain electrons in order to fill their outermost principal energy level with an octet.
5.
In the food web below, what is one example of an omnivore? fox
cricket
squirrel
mouse
A sample of nitrogen gas has a temperature of 22.7oC when the volume of the container is 12.2L and it is under 150.4kPa of pressure. What temperature, in Kelvin, would the gas need to be in order to occupy a 9.7L container at 101.3kPa? Show all your work and round your answer to the hundredths place.
Answer:
158.35 K
Explanation:
Using the general gas law
P₁V₁/T₁ = P₂V₂/T₂ where P₁ = 150.4 kPa, V₁ = 12.2 L, T₁ = 22.7 °C = 273 + 22.7 = 295.7 K, P₂ = 101.3 kPa, V₂ = 9.7 L and T₂ = unknown.
Making T₂ subject of the formula, we have
T₂ = P₂V₂T₁/P₁V₁
Substituting the values of the variables into the equation, we have
T₂ = P₂V₂T₁/P₁V₁
T₂ = 101.3 kPa × 9.7 L × 295.7 K/150.4 kPa × 12.2 L
T₂ = 290,557.777 K/1,834.88
T₂ = 158.35 K
Calculate the morality of a 35.4% (by mass) aqueous solution of phosphoric acid (H3PO4). Molar mass of H3PO4 is 98.00g/mol
Answer:
no idea with the answer pls check with otherr
If 8.82 grams of Aluminum reacts, how many grams of AlCl3 will be produced?
Hey there! :
Molar mass:
Al = 26.9815 g/mol
AlCl₃ = 133.3405 g/mol
Reaction stochemistry ,calculates the mass of AlCl3 produced
2 Al + 3 Cl₂ = 2 AlCl₃
2 * 26.9815 g Al --------------------- 2 * 133.3405 g AlCl₃
8.82 g Al ------------------------------- ( mass of AlC₃ )
mass of AlCl₃ = ( 8.82 * 2 * 133.3405 ) / ( 2 * 26.9815 )
mass of AlCl₃ = 2352.12642 / 53.963
mass of AlCl₃ = 43.58 g of AlCl₃
Hope this helps!
Gaseous ammonia chemically reacts with oxygen (O2)gas to produce nitrogen monoxide gas and water vapor. Calculate the moles of ammonia needed to
produce 0.090 mol of water.
Be sure your answer has a unit symbol, if necessary, and round it to the correct number of significant digits.
PLEASE HELP :(
What most likely accounts for the difference between curve A and curve B on
the energy diagram?
A. The reaction described by curve B is under greater pressure.
B. The reaction described by curve B is at a different temperature.
C. The reaction described by curve B has higher reactant
concentrations.
D. The reaction described by curve B is occurring with a catalyst.
Answer:
D. The reaction described by curve B is occurring with a catalyst.
Explanation:
The peak in the curve is the activation energy. According to this graph, the activation energy was lowered. A catalyst is what you can use to lower the activation energy.
The most likely accounts for the difference between curve A and curve B on the energy diagram is the reaction described by curve B is occurring with a catalyst, therefore option (d) is correct.
What do you mean by the catalyst in a reaction ?A catalyst is a chemical substance which alters the rate of a reaction without itself undergoing any permanent chemical change.
A catalyst does not initiate a chemical reaction. A catalyst does not be consumed in the reaction.
Catalysts tend to react with reactants to form intermediates and at the same time facilitate the production of the final reaction product. After the whole process, a catalyst can regenerate.
Catalysts encourage molecules to react and make the whole reaction process easier and efficient.
The most likely accounts for the difference between curve A and curve B on the energy diagram is the reaction described by curve B is occurring with a catalyst, ,hence option (d) is correct.
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2. The boat sailing on the sea slows down. What kind of friction is acting on it?
a.static friction
b. fluid friction
c. rolling friction
d.sliding friction
help me pls
Answer:
Dry friction. Dry friction resists relative lateral motion of two solid surfaces in contact. The two regimes of dry friction are 'static friction' ("stiction") between non-moving surfaces, and kinetic friction (sometimes called sliding friction or dynamic friction) between moving surfaces.