Physical and chemical laws describing the properties and behavior of gases.

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Gas Law problem related to number of molecules in two gases of same volume

10 dm cube of N2 and 10 dm cube of gas Y at the same temperature contains the same number of molecules. The gas Y is (a) CO (b) CO2 (c) H2 (d) NO
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19 views

Why do gas need to be pressurized? [on hold]

Why do we need to pressurized a gas? Do we need too? Could we also have a large amount of gas in a system but leave a bit of room to allow expansion on let's say a very hot area?
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13 views

How to keep a gas from leaking out?

I am building a system where gas flows through. It's an air tight system but I still have concern's as the gas may find microscopic holes to leave out. How can I truly keep a gas from leaking out? ...
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2answers
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Does dissociation happen in gases?

I understand that dissociation is when something dissolve. I heard this mostly only happen in liquids. But now I heard it can also happen in gases. Is this true? If so, when and why does this happen, ...
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How to stop ( Or slow down ) Diffusion Of A Gas [closed]

I want to know how can you stop, or slow down diffusion of a gas out of a system. Argon is the gas that is being use. How can we stop or at least slow down the rate if which the gas escape?
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29 views

Why are gas laws only applicable to gases?

Why are the gas laws (such as Boyle's Law, Charles's Law, and Avogadro's Law) only applicable to gas and not liquids or solids?
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Calculation of precise Methane concentration in a closed vessel (incubation bottle) (Gas chromatography)

I'm having some difficulties interpreting results from one of my experiments and more precisely, I'm lost in conversion between units, taking into accounts dilution factors etc. Basically I'm running ...
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1answer
52 views

Is there a such thing as a gas that stay a gas? [closed]

We know if you heat a liquid up it becomes a gas. But I need to know if there is a such thing as a element that is already a gas And will stay that way. If there is a such thing how could one keep it ...
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42 views

How is ideal gas law derived from all other laws (Boyle's, Charles', and Avogadro's)?

My book uses $V=\dfrac{b}{P}$ (Boyle's), $V=cT$ (Charles's), and $V=an$ (Avogadro's) to derive $V=\dfrac{nRT}{P}$. I understand this mathematical derivation. My question is: Each law has assumptions, ...
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232 views

How are van der Waals parameters determined experimentally?

If the ideal gas law $PV=nRT$ is not enough, as a second approximation the van der Waals equation $$\left(P+a\frac{n^2}{V}\right)\left(V-nb\right)=nRT$$ is applied. The constants $a$ and $b$ are van ...
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40 views

Why can't the combined gas law have T^2 as the denominator?

So, everyone knows the combined gas law, $(1)$ $\frac{P_1V_1}{T_1}=\frac{P_2V_2}{T_2}.$ The derivation comes from using Boyle's, Charles's and Gay-Lussac's laws: $P_1V_1=P_2V_2,$ $\frac{V_1}{T_1}=\...
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1answer
43 views

How does Dalton's Law relate to scuba diving?

My assignment is to create a report that emphasises on the important of chemistry more specifically the gas laws in scuba diving. I know that Dalton's Law is when the total pressure of a gas mixture ...
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2answers
29 views

Why is partial pressure used as a metric for oxygen in blood?

I know haemoglobin basically acts as an oxygen buffer. But when we talk about non-bound oxygen in blood (or water), we're referring to the amount of O2 in solution (aqueous state). From a biochemistry ...
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27 views

Free energy of solvation of gases

I am calculating free energies of solvation and enthalpies of solvation from experimental Henry constants of solubility of CO$_2$ in cyclohexane. Free energy of solvation is obtained from the relation ...
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256 views

Is this equation of state original?

I created this equation of state as a personal undergraduate summer project (here is the link) seven years ago: $$\frac{PV}{n\mathcal RT}-1\propto \left(\frac{n\mathcal RT}{PV}\right)^2\left[\left(\...
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Heating of mixture of gases with one gas barely above its boiling point

What happens when mixture of two gases is heated in a closed container? If one gas expands faster than the other and increases pressure of the container enough so that the boiling point of the other ...
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49 views

Amount of NO produced in reaction between PbS and HNO3

Lead(II) sulfide dissolves in excess nitric acid according to the equation below. Calculate the volume of $\ce{NO{(g)}}$ at $27 ^\circ \mathrm{C}$ and $1.10\ \mathrm{atm}$ produced from $4.7\ \mathrm{...
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27 views

how to seperate butane from air?

I work in a manufacturing company specializing in polyethelene foam and I have been struggling to separate butane from air in our warehouse during curing period where all the butane gas use to make ...
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22 views

Doubt on Graham's Law of diffusion

Let's say i have two gases in 2 different containers ( with different temperature values ) And i want to compare the respective rates of diffusion. at time=$t$ , would the ratio $ \frac{r_1}{r_2} $ ...
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1answer
51 views

How to calculate the total number of atoms in a mixture of mono- and biatomic gases [closed]

My homework is as follows: A gas mixture contains 33% $\ce{O2}$, 60% $\ce{N2}$, and 7.0% $\ce{He}$, as volume percent. Calculate the total number of atoms of all types of gases present in 5.0 L ...
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58 views

Vapor-pressure or Vapor-concentration

To summarize from my textbook: rate of evaporation: proportional to surface area but essentially independent from pressure (of surrounding gas) rate of condensation proportional to both surface ...
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1answer
43 views

How to calculate the amount of substance of nitrogen that dissolves in water?

The Henry's law constant for the solubility of $\ce{N2}$ gas in water at $298~\mathrm{K}$ is $10^5~\mathrm{atm}$. The mole fraction of $\ce{N2}$ in air is $0.8$. The amount of substance of $\ce{N2}$ ...
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1answer
67 views

How to understand Nelson-Obert charts?

The compressibility factor is given by: $$ z=\frac{P\overline{V}}{RT} $$ The Nelson-Obert chart is: This chart brings the following information: At very low pressure (Pr << 1), gases ...
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2answers
45 views

Volume of gas given off RHS with volume of gas used in one part of LHS

So I have the following equation: $$\ce{2SO2 + O2 -> 2SO3}$$ and the question: 100cm^3 of sulphur dioxide is used, what volume of sulphur trioxide is given off? Can someone please explain how I ...
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28 views

Why does O2 gets less compressed as compared to CH4 when pressure is applied

As I understand that the compression depends on the attractive forces between the molecules. And considering that both $\ce{O2}$ and $\ce{CH4}$ dont have any dipole-dipole interaction with their ...
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1answer
29 views

Specific Heat affected by Pressure

I know the specific heat depends (slightly) on the conditions present. For example, methane's specific heat is 2.5 at 400 K, but 4.5 at higher temperatures. How might specific heat depend on pressure,...
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22 views

Maxwell Speed Curves for Gases

Can someone explain me why is this working. Why are we rotating at same speeds ? Aren't many molecules not passing ? How can the detector tell which are fast and which are slow ?
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How to calculate the gas pressure of HCl over a saturated CuCl2 solution

I have a concentrated solution of $\ce{CuCl2}$ ($<200~\mathrm{ml}$, surface area $2100~\mathrm{cm^2}$). I saw a note about protecting metal equipment from $\ce{HCl}$ attack in the room ($<20~\...
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1answer
42 views

Boyle's Gas Law Questions

Q1. If 1.00L of oxygen gas at 1.00 bar pressure is combined with 1.00L of nitrogen gas at 1.00 Bar pressure in a 2.00L vessel, what is the total pressure in the vessel? a) 0.50 bar b) 1.00 bar c) 2....
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Can you derive a formula for any internal energy of a gas as long as you know the degree of freedom?

I have the following formula that I derived from studying my textbook that generalizes to all ideal gases: Monoatomic molecular gases ($\ce{He, Ne}$ etc.) Degree of freedom: 3 $\ce \frac{3}{2}nRT = ...
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1answer
127 views

How does Carbon Dioxide have a degree of freedom of 6?

Carbon Dioxide has a degree of freedom of 6, yet from what I understand, it is a linear molecular shape. Therefore, the number of axis of linear movement is 3 (x,y,z) but there are only two axis of ...
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How much CO2 is produced by plant litter?

I made measurements of CO2 formed during decomposition of dead plant material using gas spectrometer. It gives the results of CO2 in ppm. How do I convert it to $\large \rm \frac{mg~CO2}{\text{1 g ...
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63 views

Ionization Energy and Electron Affinity

This is from my textbook. But in other reference books I am using and Wikipedia, there is not any mention of absolute zero while defining Ionization Energy and Electron Affinity. What does it mean? ...
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17 views

Thermodynamics of mixture of gases and gas to liquid transformation of particular gas in mixture of gases

I am working on converting the nitrogen and sulphur dioxide from gas to liquid in the mixture of $\ce{CO2}$, nitrogen and sulphur dioxide. For continuous conversion from gas to liquid phase, I want to ...
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9 views

Polarity-specific membrane in a gas

Would it theoretically be possible to have a membrane within a gas only permeable by polar molecules? For instance, a membrane impermeable to oxygen as opposed to water vapour.
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Gas solubility in water and alcohol

I know that a certain gas is soluble in water but not in alcohol. How can I find the solubility of the gas in mixture of water and alcohol? Do I use a simple linear relation? The gas in question is ...
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45 views

Calculating the mass of air under pressure [closed]

A popular scuba tank is the "aluminum 80," so named because it can deliver 80 cubic feet of air at "normal" temperature (72F) and pressure (1.00atm) when filled with air at a pressure of 3000psi. A ...
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23 views

Arterial blood CO2 content, division and partial pressure

My lecturer cites Boron and Boulpaep's Medical Physiology (2nd edition) for the following claims: the total $\ce{CO2}$ content of arterial blood is $26.4$ mmol/L or $48\%$ v/v (not sure if these ...
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1answer
42 views

Calculating molar mass from gas data

34.05 mL of phosphorus vapour weighs 0.0625 g at 546 °C and 0.1 bar pressure. What is the molar mass of phosphorus? I tried to solve the above question and got 1249.8g. The book's answer sheet lists ...
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1answer
25 views

Is it possible to have an airborn fluorescent particle that reacts to lightning?

I want to measure the expansion of the atmosphere when it is heated and impacted by lightning, to have an idea of the propagation of sound waves made by lightning. To do this, the ideal would be to ...
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2answers
57 views

In the following question, why should the volume be less than 11.35L instead of greater than 11.35L?

A balloon is filled with hydrogen at room temperature. It will burst if pressure exceeds 0.2 bar. If at 1 bar pressure the gas occupies 2.27 L volume, upto what volume can the balloon be expanded? ...
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1answer
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gas volume of reactants [closed]

I am revising gas volume equations and I can figure out the volume and moles of the product when given a reactants moles however i am struggling on figuring out the mass of one reactant when i have ...
2
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1answer
74 views

Doubts on Diffusion/ Effusion of gases at different pressures

Let's start with a question: "One mole of nitrogen gas at 0.8 atm takes 38 s to diffuse through a pinhole, whereas one mole of an unknown compound of Xenon with flourine at 1.6 atm takes 57 s ...
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1answer
44 views

Thermodynamics : Work Done by a Gas

Suppose in a piston in which there is a gas, the gas exerts pressure P on surroundings, whereas the surrounding exerts a pressure $P[ext]$ on the gas. In order for the gas to expand, P must be ...
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Pressure of carbon dioxide due to two simultaneous equilibriums

$1~\mathrm{mol}$ each of barium carbonate and calcium carbonate are put in a closed vessel which is maintained at $300~\mathrm{K}$ temperature. Two equilibria are established, with the respective ...
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1answer
69 views

Pressure Cooker at High Altitudes and Low Altitudes

I just have a doubt if I'm right or wrong about this. Please explain more if possible. Also, I have some questions regarding boiling point and vapour pressure. High Altitude Cooking At high ...
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1answer
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Real Gas Equation

When a real gas has a pressure lower than the expected value from ideal gas (because of the intermolecular force of attraction) , we have - $$P_{\text{ideal}}= P_{\text{real}} + \frac{an^2}{V^2}$$ ...
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Ideal Gas Equation for an equilibrium mixture: how to work out n number of moles

Methanol can be manufactured by the reaction of carbon monoxide and hydrogen. $$\ce{CO (g) + 2 H2 (g) <=> CH3OH (g)}$$ The equilibrium mixture contained $0.452~\mathrm{mol}$ of carbon monoxide, ...
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2answers
69 views

What causes transition from smoldering combustion to flame combustion?

What causes the transition from smoldering combustion to flame combustion? From what I have read about it is that, smoldering combustion gives off a lot of flammable gases, primarily, Carbon Monoxide,...
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2answers
68 views

How would Dalton's law be affected when there are two ideal gases in a container at different temperatures?

How would Dalton's law be affected when there are two ideal gases in a container at different temperatures? Let the gas with higher temperature be gas A and the gas with lower temperature be gas B....