Continue adding salt to the solution until undissolved salt remains on the bottom of the container. this is now a (a)saturated solution because no more sodium chloride can dissolve. The simplest ratio of ions in the solution is (b)1 sodium ion to (c) 1 chloride ion and the simplest ratio of ions bound in the solid is (d) sodium ion to (e) chloride ion.
Water molecules pull the sodium and chloride ions apart, breaking the ionic bond that held them together. After the salt compounds are pulled apart, the sodium and chloride atoms are surrounded by means of water molecules, as this diagram indicates. as soon as this happens, the salt is dissolved, resulting in a homogeneous solution .
Dissolving a solid in liquid, inclusive of desk salt in water, is a bodily exchange because only the country of the matter has changed. A not unusual misconception approximately dissolving is that heating and/or stirring are required for the dissolving process to arise. on this observe, quantitative experimental evidence turned into accrued and analyzed to illustrate that neither heating nor stirring is required for dissolving.
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1. How many moles are present in 9.25x10^34 molecules of H2O?
2. How many moles are present in 4.51x10^15 atoms of Aluminum (AI)?
3.How many moles are present in 3.78x10^20 atoms of Lithium (Li)?
What is Stoichiometry?
Stoichiometry is the relationship between two substances through use of ratios.
To answer these questions, you must use the ratio:
1 mol of a substance
6.022 × 10²³ molecules
Let's try the first question:
9.25 × 10³⁴ molecules H₂O × 1 mol H₂O
6.022 × 10²³ molecules
The molecules will cancel out, leaving you with
9.25 × 10³⁴ mol
6.022 × 10²³ mol
Use your calculator to solve: 1.536 × 10¹¹ mol H₂O
Now, follow this same format to solve the rest of the questions:
2) 4.51 × 10¹⁵ molecules Al × 1 mol Al
6.022 × 10²³ molecules
= 4.51 × 10¹⁵ mol Al
6.022 × 10²³ mol Al
= 7.489 × 10⁻⁹ mol Al
3) 3.78 × 10²⁰ molecules Li × 1 mol Li
6.022 × 10²³ molecules
0.0006276 mol Li
_________________________________________________________
1.536 × 10¹¹ mol H₂O7.489 × 10⁻⁹ mol Al0.0006276 mol LiChoose the right electron configuration of xenon with the abbreviation of the previous noble gas to represent inner-shell electrons. a. [Kr]5s^2 4f^10 5p^6 b. [Kr]5s^2 4d^10 5p^6 c. [Kr]5s^2 5p^6 d. [Kr]5s^2 4d^8 5p^6 6s^2
c. [Kr]5s^2 5p^6 electron configuration of xenon with the abbreviation of the previous noble gas to represent inner-shell electrons.
Xenon is a rare, inert, colorless, tasteless, and chemically inert gas. Before Neil Bartlett reported on the synthesis of xenon haxafluoroplatinate in 1962, it was thought to be entirely inert. When stimulated by an electrical discharge, xenon produces blue light within a gas-filled tube. There are not many commercial applications for xenon.
The smallest atom-building block, the electrons has a negative charge. A neutral atom has an equal amount of protons and electrons. For instance, the hydrogen atom only has one proton and one electron.
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the decomposition of has a rate constant of at a certain temperature: determine the rate of the reaction , when ?
The rate equation illustrates how altering the reactant concentrations affect the rate of the reaction. All of these are incorporated into the so-called rate constant, which is only really constant if the only variable changing is the reactant concentration.
what do you mean by the rate constant?The rate constant is the quantity that describes the connection between the molar concentration of the reactants and the rate of the chemical reaction. At 546 K, the hydrocarbon breakdown rate constant is 2.418 105 s1.
How can the rate constant k be determined for a particular temperature?The slower the reaction is at a given temperature, the greater the Ea. The steric factor is the percentage of orientations that cause a response. The Arrhenius equation has a relationship between the rate constant and the frequency factor, steric factor, and activation energy: k=AeEa/RT.
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write the balanced net ionic equation for the reaction when strontium chloride and sodium phosphate are mixed in aqueous solution. if no reaction occurs, simply write only nr. be sure to include the proper phases for all species within the reaction.
3[tex]Sr^{2+}[/tex](aq) + 6Cl- (aq) + 6Na+ (aq) + 2PO43-(aq) → Sr3(PO4)2(s) + 6Na+ (aq) + 6Cl- (aq) is the balanced net ionic equation for the reaction when strontium chloride and sodium phosphate are mixed in aqueous solution.
What is ionic equation?When the general reaction equation of any reaction is represented by dissociating its ions is know as ionic equation.
Given:
Strontium chloride and sodium phosphate are mixed in aqueous solution to react.
To find:
The balanced net ionic equation for the given statement.
So,
first the general reaction equation for the given Statement is given below
3SrCl2 (aq) + 2Na3PO4(aq) → Sr3(PO4)2(s) + 6 NaCl(aq)
Now, we dissociate the ions to get the ionic equation for the same given reaction for the statement provided above:
So the net ionic equation for the same is :
3[tex]Sr^{2+}[/tex](aq) + 6Cl- (aq) + 6Na+ (aq) + 2PO43-(aq) → Sr3(PO4)2(s) + 6Na+ (aq) + 6Cl- (aq)
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a mixture of hehe , n2n2 , and arar has a pressure of 15.215.2 atm at 28.028.0 °c. if the partial pressure of hehe is 25452545 torr and that of arar is 30833083 mm hg, what is the partial pressure of n2n2 ?
The partial pressure of each component is based on its mole fraction and the given total pressure: PO2=0.622×565 mm Hg=351 mm HgPN2=0.378×565 mm Hg=214 mm.
The partial pressure of N2 N2when the partial pressure of He is 24751 should be 7.47 atm.
What is Partial Pressure?
In a gas mixture, each constituent gas has a partial pressure equal to the notional pressure of its constituent gases as if they alone occupied the entire volume of the original mixture at the same temperature.
Therefore, The partial pressure of each component is based on its mole fraction and the given total pressure: PO2=0.622×565 mm Hg=351 mm HgPN2=0.378×565 mm Hg=214 mm.
The partial pressure of N2 N2when the partial pressure of He is 24751 should be 7.47 atm.
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if the volume of the system is reduced to one half of its original volume and the system is allowed to restablish equilibrium at 298k, what will be the pressure in atm, of the water vapor at the new volume
According to ideal gas law ;
PV = nRT where, P refers to the pressure of the ideal gas, V is the volume of the ideal gas, n is the total amount of ideal gas that is measured in terms of moles, R is the universal gas constant, and T is the temperature.
If Volume of system is reduced to half = V/2
then; P = 2(nRT/V), Pressure will be doubled to reestablish the equilibrium.
What is Chemical equilibrium?
Chemical equilibrium, condition in the course of a reversible chemical reaction in which no net change in the amounts of reactants and products occurs. A reversible chemical reaction is one in which the products, as soon as they are formed, react to produce the original reactants.
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Calculate the standard reaction entropy for the decomposition of 1 mol calcite to carbon dioxide gas and solid calcium oxide at 25°c.
For the breakdown of 1 mol of calcite to carbon dioxide plus white precipitate oxide at 25°c, the standard reaction entropy is 160.6 J/mol*K.
How do you define reaction in chemistry?In a chemical reaction, one or more materials known as reactants—are changed into one or more additional substances as products. Chemical elements or chemical compounds make up substances.
What kind of response?Synthesis, decomposition, only one, double-replacement, and combustion are the five fundamental varieties of chemical reactions. You can classify a reaction into one of these groups by looking at the reactants and products. Several categories will apply to some reactions.
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The complete question is-
Calculate the standard reaction entropy for the decomposition of 1 mol calcite to carbon dioxide gas and solid calcium oxide at 25°C.
CaCO₃ (s) → CO₂ (g) + CaO (s)
(a). -160.6 J/mol*K
(b). 160.6 J/mol*K
(c). 346.4 J/mol*K
(d). -266.9 J/mol*K
Partial bonding, for example, as part of a resonance hybrid, often results in structures with _____.
Partial bonding, for example, as part of a resonance hybrid, often results in structures with fractional bond orders.
What is resonance hybrid?
A resonance hybrid is a substance that exhibits resonance and has a structure that is stated as the average of two or more structural formulas, each of which is separated from the next by a double-headed arrow. For instance, benzene.
It is possible to explain the equal bond lengths using the resonance hybrid of this polyatomic ion, which was created from its various resonance structures.
Therefore, Partial bonding, for example, as part of a resonance hybrid, often results in structures with fractional bond orders.
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What mode of transportation is limited to specialized products such as liquids and gases?.
Pipeline transportation is only available for specialist goods like liquids and gases.
What makes liquid?Delicate, invisible particles that are constant motion and layer on top of one another make up liquids. The particles are held together by cohesive forces, yet they are not firmly adhered to one another as in a solid. Despite touching one another, the particles can still pass freely one another.
What is liquid in physics?An liquid is still a sample of stuff that adopts the shape of the container it is stored in and develops a defined surface when gravity is present. The state, or situation, of substance having this attribute is also referred to as liquid.
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this is the chemical formula for methyl tert-butyl ether (the clean-fuel gasoline additive mtbe):a chemical engineer has determined by measurements that there are moles of carbon in a sample of methyl tert-butyl ether. how many moles of oxygen are in the sample?be sure your answer has the correct number of significant digits.
According to Dalton's Atomic Theory, the individual elements making up the compound has a fixed ratio. This law is known as the Law of Definite Proportions. Obeying this law, the number of hydrogen to oxygen should be a constant, so we can use ratio and proportion.
The ratio can be determined from the molecular formula of methyl tert-butyl ether: C5H12O. This is the correct molecular formula of the compound. To check, try searching it in the internet. From the molecular formula, we can see that there are 5 carbons in every 12 hydrogens and in every 1 oxygen. So, the hydrogen to oxygen ratio is 12/1. Applying ratio and proprotion,
12/1 = 0.0723 moles of hydrogen/x, where x is the amount of moles oxygen. Solving for x,
x = 0.006025 moles of oxygen
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Commercial methods for making fatty acid methyl esters (FAMEs): • Base-catalyzed transesterification of the oil with ________________.
Commercial methods for making fatty acid methyl esters (FAMEs). Base-catalyzed transesterification of the oil with Sodium Methoxide.
What is FAME used for?The generic chemical term for biodiesel derived from renewable sources is Fatty Acid Methyl Ester. It is used to supplement or replace mineral diesel and gas oil, which are used to power on- and off-road vehicles as well as static engines.It is formed during the biodiesel production process when vegetable oils and animal fats are transesterified. In the presence of a catalyst, usually potassium hydroxide, these high molecular weight oils and fats react with short chain alcohol to produce lower molecular weight esters (FAME).Transesterification is the process of separating the three alkoxy groups from the triglyceride's glyceryl backbone. As a byproduct of the reaction with the alcohol, three lower molecular weight esters are formed. The catalyst in the reaction is potassium hydroxide.To learn more about Fatty Acid refer :
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Student a says the δ h value of an exothermic energy change is always positive. Student b says δ h value of an exothermic energy change is always negative. Who is correct?.
Specific heat capacity of a substance is the amount of heat required to raise the temperature by one degree Celsius of one gram of a substance. Therefore, student a and student b are correct.
What is Enthalpy?Enthalpy term is basically used in thermodynamics to show the overall energy that a matter have. Mathematically, Enthalpy is directly proportional to specific heat capacity of a substances.
Mathematically,
q = n ×ΔH
where
q = amount of heat
n = no of moles
ΔH = enthalpy
n = w / M.M
Both students are correct as energy can be positive as well as negative. Any reaction in which energy is added, energy value comes out to be positive and reaction is called endothermic reaction. Any reaction in which energy is released, energy value comes out to be negative and reaction is called exothermic reaction.
Therefore, student a and student b are correct.
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Arrange the following gases in order of increasing average molecular speed at 25 °c. He, o2, co2, n2.
The average molecular speed at 25°C is: CO₂ < O₂ < N₂ < He.
What is average molecular speed?The speed associated with atom collecting is typical. The particles in an ideal gas do not interact with one another. There are three kinds of molecular speeds: rms (root mean square) velocity, average velocity, and most likely velocity.
A gas's average speed is determined by its molar mass; the smaller the mass, the quicker the average speed.
Average molecular speed is inversely proportional to molar mass.
So, if molar mass is large, average velocity will be small.
Now, order of molar mass is: He < N₂ < O₂ < CO₂
So, order of average speed will be: CO₂ < O₂ < N₂ < He.
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Nuclear decay occurs according to first-order kinetics. A nuclide decays in 3. 40 days from 45. 0 g to 12. 1 g. What is the rate constant for the nuclide?.
The equilibrium law for the nuclide is 0.388 days per one, according to the announcement.
By nuclide, what do you mean?
The amount of protons, protons, and the activity state of nucleus determine the species of atom known as a nuclide, also known as a nuclear species. Thus, a nuclide is identified by its number of protons and mass number (A) (Z).
Does a nuclide resemble an atom?A nuclide is similar to but distinct from an atom or a nucleus. It has several nucleons, which define it. Nuclide, to put it simply, is a type of atom or nucleus. We characterize it using the elements that make up its nucleus, as well as the quantity of protons, neutron, and energy.
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In aerobic respiration, during electron transport in the chain nadh is oxidized at _____, while fadh2 is oxidized at _____.
In aerobic respiration, nadh is oxidized at complex I during electron transport in the chain, while fadh2 is oxidized at complex II.
What is electron?GitHub created and maintains the open-source, free software framework known as Electron. The framework is made to enable the development of desktop web apps with a backend running on the Node.js runtime environment and being rendered using a variant of the Chromium browser engine. Unbound or bound to an atom, an electron seems to be a negative charge subatomic particle (not bound). The proton, neutron, and the electron that is attached to an atom are the three main types of particles.
What is electron used for and its example?JavaScript, HTML, and CSS can be used to create desktop applications using the Electron framework. With Electron, you can build cross-platform programs that run on Windows, macOS, and Linux with no prior knowledge of native development by incorporating Chromium and Node.js into its binary.
The electron, the smallest elemental part of an atom, has a negative charge. Protons and electrons both occur in equal numbers in neutral atoms. One electron and one proton are all that the hydrogen atom has. On the other hand, the uranium atom has 92 protons, which means 92 electrons.
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How many unhybridized p orbitals are there around the central atom of beryllium chloride, becl2?.
Around the centre beryllium atom, there are two zones of electron density that will arrange themselves in a linear geometry. There must be two unhybridized p orbitals in BeCl2 since beryllium must be sp hybridised.
The areas of electron density are corresponding to hybridised orbitals. The number of unhybridized p orbitals can be calculated by deducting the number of electron density regions from the maximum number of hybridised 1s and 3p orbitals, which is 4.
What is the unhybridized orbital?
The common atomic orbitals that we are familiar with are those that are not hybridised. Orbitals that are hybridised are made up of a variety of unhybridized orbitals. These orbitals aid in determining the shape of molecules by illuminating the actual bonding process.
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how many atoms are there in one molecule of h3po4 ? how many atoms of each element are there in one molecule of h3po4 ? how many atoms are there in one molecule of ? how many atoms of each element are there in one molecule of ?
There are 8 atoms in total in one molecule of H3PO4.
There are 3 atoms of hydrogen, 1 atom of phosphorous and 4 atoms of oxygen in the one molecule of this compound, which is called hydrogen phosphate.
The charge number of an atomic nucleus is known as the atomic number or nuclear charge number (sign Z) of a chemical element. This is equivalent to the proton number (np), or the number of protons present in the nucleus of every atom of that element, for conventional nuclei. Ordinary chemical elements can be uniquely identified by their atomic number. The atomic number and the number of electrons are both equal in a typical, uncharged atom.
The total number of atoms in one molecule can be calculated as :
= 3 (H) + 1 (P) + 4(O)
=8 atoms in total
Therefore, there are 8 atoms in total in one molecule of H3PO4.
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the concentration of sodium chloride in blood serum is approximately 0.14 m. what volume (in liters) of blood serum contains 2.0 g of nacl?
The molarity of the solution and the number of moles of the solute can be used to calculate the volume of a solution. Blood serum at a concentration of 0.14 M and 2g of NaCl is 0.24 L in volume.
The term "molarity" of a material refers to its concentration. It is the proportion of the solute's moles to the liters of solution. Temperature affects a substance's molarity.
The number of moles of solute and the volume of the solution both affects the molarity of the solution. The blood serum has a molarity of 0.14 and 20g of sodium chloride.
NaCl has a molar mass of 58.5 g/mol. The following formula is used to determine how many moles of NaCl are present in the 2 g sample:
2 g = 58.5 moles in terms of moles.
= 0.034 moles.
Now, the blood serum volume is determined using the formula below:
Volume is equal to moles times molarity.
= 0.14 mol/L and 0.034 moles
= 0.24 liter.
As a result, 0.24 L of 0.14 M blood serum contains 2 g of NaCl.
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Derive an expression for the total mechanical energy e of the moon in terms of m, m, d and the gravitational constant g.
Fm1m2 = Gm1m2/r2 * r. A planet with a mass of M and a radius of b is orbited by a moon with a mass of m and a radius of an at a distance of d (center to center).
A mass is what?The quantity of material in a material or an object is measured by its mass. The kilogram (kg) is the fundamental SI unit of mass, while lower masses can also be expressed in grams (g). A balance is what you would use to measure mass.
How is mass determined?The kilogram (kg) is the fundamental SI unit of mass, while lower masses can also be expressed in grams (g). A balance is what you would use to measure mass. A triple beams balance can be used to quantify mass in the laboratory.
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a cup of hot coffee initially at 95ºc cools to 80ºc in 5 min while sitting in a room of temperature 21ºc. using just newton’s law of cooling, determine when the temperature of the coffee will be a nice 50ºc
A cup of hot coffee initially at 95ºc cools to 80ºc in 5 min while sitting in a room of temperature 21ºc. using just newton’s law of cooling, determine when the temperature of the coffee will be a nice 50ºc
In 10 minutes the hot coffee will attain the temperature of 50 degrees Celsius.
Initially the hot cup of coffee at the temperature of 95 degrees Celsius but after 5 minutes its temperature decreases from 95 to 85 degrees Celsius which is 15 degrees Celsius decrease so in other 5 minutes, the temperature decreases to 65 degrees Celsius.
Again after 5 minutes the temperature will further decrease finally the cup of coffee attain the temperature of 50 degrees Celsius so we can conclude that in 10 minutes the hot coffee will gain the 50 degrees Celsius temperature.
According to Newton's Law of cooling, the charge of loss of heat from a body is immediately proportional to the difference in the temperature of the frame and its surroundings.
The price, wherein a frame that is uncovered, modifications the temperature thru radiation is about proportional to the difference among the item's temperature and its environment, and the furnished difference is low. that is called Newton's law of cooling.
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the interaction between s and p molecular orbitals causes what changes in the molecular orbital diagram of a simple diatomic molecule?
The energy gap between the 2s & 2p orbitals widens from boron to fluorine due to the difference in the nucleus's attraction for 2s and 2p.
As would be expected, the energy gap between the 2s and 2p orbitals in atoms like Li, Be, B, C, and N is quite small, which causes the 2s and 2pz orbitals in the diatomic molecule that results from mixing these atoms to overlap. We refer to this as "2s-2p mixing." This causes the energy of 2pz to rise, surpassing that of 2px and 2py, which is not the case for oxygen and fluorine.
Hence, diatomic molecule on s-p mixing result energy gap.
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if you completely react 6 moles of h2 gas (with n2 as excess), how many moles of nh3 can be produced?
The number of moles of NH3 can be produced are 4 moles.
What is a mole?
The mole is the amount of substance in a system that includes the same number of elementary entities as there are atoms in 0.012 kilogram of carbon 12; it is denoted by the sign "mol."
What is a limiting factor?
Limiting factors are reactants or reagents that are used by a chemical reaction before other reactants. The limiting factor is the reactant or reagent with the lowest supply in terms of its required ratio in comparison to other reactants in the system.
According to the question;
Balanced equation would be :
[tex]3H_2 + N_2[/tex] ⇒ [tex]2NH_3[/tex]
Here, [tex]H_2[/tex] is a limiting factor
No. of moles of ammonia formed when 3 moles of [tex]H_2[/tex] react with excess of [tex]N_2[/tex] =2
applying unitary method:
No. of moles of ammonia formed when 6 moles of [tex]H_2[/tex] react with excess of [tex]N_2[/tex]= [tex]\frac{2}{3 } * 6[/tex] = 4moles.
The number of moles of NH3 can be produced are 4 moles.
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A solution of potassium hydroxide (koh) is titrated against a solution of hydrochloric acid. How many moles of potassium hydroxide would react with 1 mole of hydrochloric acid?.
1 mole of potassium hydroxide would react with 1 mole of hydrochloric acid.
The balanced equation for the reaction is as follows:
[tex]KOH + HCl[/tex]→ [tex]KCl + H_{2} O[/tex]
Titration is defined as "the process of determining the quantity of a substance A by adding measured increments of substance B, the titrant, with which it reacts until exact chemical equivalence (the equivalence point) is achieved."
Titration is a common quantitative chemical analysis laboratory method for determining the concentration of an identified analyte. The titrant or titrator is a reagent that is prepared as a standard solution of known concentration and volume.
The titration's goal is to find the equivalence point, or the point at which chemically equivalent amounts of the reactants have been mixed. The amount of reactants mixed at the equivalence point is determined by the stoichiometry of the reaction.
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with what compound will nh3 experience only ion-dipole intermolecular forces? group of answer choices ocl2 licl ch3i c3h7oh sih4
Here, we must select a chemical capable of producing an ion-dipole interaction with ammonia. Only b) NaOH will interact with the ion dipole of the NH3.
How does a dipole of ions operate?
When an ion interacts with a nonpolar molecule, a weak attraction called an ion-induced dipole force is created. In addition, a fully charged ion can polarize a nonpolar molecule by approaching it; as a result, the electrons in the molecule react and produce a dipole.
What makes it an ion-dipole?
Dipole-Ion Interaction
An electrically charged atom or molecule is known as an ion (which is to say the opposite of a neutral molecule). The term "dipole" simply refers to the presence of two poles that are negatively and positively charged. Another name for a molecule having a dipole is a
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a sample of an ideal gas has a volume of 2.37 l2.37 l at 286 k286 k and 1.06 atm.1.06 atm. calculate the pressure when the volume is 1.67 l1.67 l and the temperature is 305 k.
The pressure when the volume is 1.67 l and the temperature is 305 k 1.604 atm.
Using the ideal gas equation:-
Given;
P₁ = 1.06 atm
V₁ = 2.37 L
T₁ = 286 K
P₂ = ?
V₂ = 1.67
T₂ = 305 K
P₁V₁/T₁ =P₂V₂/T₂
P₂ = P₁V₁T₂ /T₁V₂
= 1.06 × 2.37 × 305 / 286 × 1.67
= 766.221 / 477.62
= 1.604 atm
What is Pressure?
The physical force exerted on an item is called Pressure. The force applied is vertical to the surface of items per unit area. The basic formula for pressure is Force/Area.
What is an ideal gas?
An ideal gas is an intransigent gas composed of a set of irregularly-moving point atoms that interact only through elastic conflicts.
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What is the proper rate of cpr compressions for the adult cardiac arrest victim?.
The recommended pace for CPR compressions for an adult cardiac arrest sufferer is 100 to 120 per minute.
What are compressions?Compressions entail applying particular pressure towards the person's chest with your hands while pressing down quickly and firmly. Compressions constitute the most crucial CPR procedure. When administering CPR compressions, follow these steps: Place the person on a stable surface while holding her back up.
What do compressions do in CPR?CPR simulates your heart's pumping action by doing chest compressions. These compressions support your body's natural blood circulation. Heart disease and cardiac arrest are not the same thing. A heart condition occurs when the flow to the coronary artery is blocked.
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identify the equation that relates the heat gained or lost by the reaction to the heat gained or lost by the solution and calorimeter.
The heat gained or lost by the calorimeter, q cal, is determined from the formula, qcal = Ccal×Δt, where Δt is the change in temperature undergone by the mixture.
What is the definition of calorimetry?Calorimetry is the study or practice of monitoring changes in a body's state variables for the goal of determining the heat transfer associated with those changes, such as those brought on by chemical reactions, physical changes, or phase transitions, within certain bounds.
How do you calculate calorimetry?q = msp heatt, where q = heat quantity, expressed in joules (J). 1 degree C Mass, expressed in grams, is K. m. t = °C or K of temperature change. The amount of heat needed to increase the temperature of a specified quantity of a substance by one degree is known as the heat capacity, or C, of the substance.
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K-42 has a half-life of 12.0 hours. At present, a given ore sample contains 34.2 mg of K-42. How much did it contain yesterday at the same time?
The amount of sample of K-42 yesterday at the same time is equal to 136.8 mg.
What is the half-life of radioactive material?The half-life of the radioactive material can be described as the time required to decrease its original amount to half after decay. The half-life of a radioactive element does not depend on the initial amount of the substance.
Consider that N₀ is the initial amount of the K-42 sample
Consider that 'n' is the number of half-lives of K-42.
The time for which K-42 decay, t = 24 hrs
Half-life of substance (t½) = 12 hrs
t = n ×t½
24 = n × 12
n = 2
Assume that N₀ is the amount of the K-42 before decay for 24 hours.
N ×2² = N₀
34.2 × 4 = N₀
N₀ = 136.8 mg
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An element from group 13 bonds with an element from group 17. Which formula correctly depicts the correct chemical formula for elements from these two groups?.
A chemical compound is created when metals and nonmetals mix in a specific ratio. AlCl3 is the compound that will be created from elements in groups 13 and 17.
A chemical compound is made up of several related molecules (or molecular entities), each of which has atoms from various chemical elements and is joined by chemical bonds. A molecule is not a compound because it is made up of only one element's atoms. A chemical reaction can convert one element into another and may involve interactions with other molecules. In the course of this process, atom-to-atom bonds may form or break.
Using the common chemical symbols with numerical subscripts, a chemical formula defines the number of atoms of each element in a compound molecule. The Chemical Abstracts Service has given a lot of chemical compounds a special CAS number that serves as an identification. More than 350,000 chemical compounds (including chemical combinations) have been registered for manufacturing and use globally.
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Calculate the work associated with the compression sof a gas from 121. 0 l to 80. 0 l at a constant pressure of 16. 7 atm.
The amount of energy required to compress a gas from 121 litres to 80 litres at a constant pressure of 16.7 atm is 6.94*10^4J. When the need for water increases in a system with constant pressure
As the demand for water falls, the pump speed will also decline. The pump only runs as much as required to fulfil demand in order to maintain pressure as efficiently as feasible. Using the following expression, we can determine the work (W) connected to gas compression at constant pressure:
W = -P.V, where P is the outside pressure.
V represents the volume change.
In light of the fact that 1 atm.L = 101.325 J, the work of compression is given by W = -P*(v2 - v1) = -16.7atm*(80.0 - 121.0)*(101.325/1) = 6.94*10^4J.
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