# Questions tagged [gas-laws]

Physical and chemical laws describing the properties and behavior of gases. This tag currently applies to properties and laws concerning both ideal and real gases.

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### Finding porosity using Ideal gas law

A 1 $cm^3$ sample or reservoir rock is put in a chamber of 10 $cm^3$, where the total pressure is 750 $mmHg$. This chamber is closed, and a valve is opened such that the air can expand to another ...
43 views

### Is there a homogeneity issue when two gases are mixed and filled in a vessel? [duplicate]

When two gases (one light and one heavy) are mixed in a 36m3 vessel (mole ratio 6.5%) is there a concern about the homogeneity of the gases (101 psi)??
90 views

### Does increasing temperature increase the rate of gaseous reactions?

In chemical kinetics there is a generalised statement that the rate of reaction is dependent upon the concentration of reactants (except for zero order/complex reactions) temperature catalyst surface ...
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### Enthalpy of reaction with equal amounts of gaseous products and reactants

At a constant pressure and temperature the enthalpy change for a reaction (assuming ideal gas law) is given as $$\Delta_\mathrm{rxn}H = \Delta n_\mathrm{g}C_pT,$$ where $\Delta n_\mathrm{g}$ is the ...
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### Calculating pressure inside a bag using the ideal gas laws

I was doing an experiment to inflate a bag using CO2 produced from a reaction between baking soda and vinegar. I came up with a balanced chemical equation and used the ideal gas law to calculate the ...
71 views

### Volume of gas mixture [closed]

I have inlet to a reactor formed by equimolar CH4 and NH3, I want to find the volume of this gas mixture. First I wanted to calculate the sum of individual volumetric flow rates from V = m*rho. ...
23 views

### Is rate of effusion directly proportional to pressure [duplicate]

From Graham's law of effusion we know that rate of effusion is inversely proportional to square root of density of gas but if two gases are being effused at different pressures then is rate directly ...
1 vote
141 views

### Why do reduced variables for gases use their critical constants?

I understand why it's useful to have reduced variables, especially as it is the basis for the theorem of corresponding states. However, I'm having a hard time understanding why the critical constants ...
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1 vote
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### Bubbling air through hydrochloric acid to generate HCl gas

I am trying to build a system to generate dry HCl gas. I was wondering if you bubble air through diluted HCl will it produce a gas with mostly water vapor or HCL vapor, can we vary the proportions of ...
127 views

### Why is the relationship between vapour pressure and boiling point of water non-linear?

From my rudimentary understanding of chemistry, pressure should be directly proportional to temperature for a constant mass of gas under the same volume (Charles’s law). However, in the diagram above,...
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1 vote
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### Deviation from ideal gas behavior

I know that gases deviate from ideal behavior at low temperature and high pressure But what if we increase the pressure of a gas by increasing the temperature keeping the volume constant. Would the ...
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### Is gas solubility independent of pressure?

My physical chemistry textbook poses this question: Prove the statement that an alternative way to express Henry’s law of gas solubility is to say that the volume of gas that dissolves in a fixed ...
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### Understanding Rossini and Frandsen experiment for measuring $(\partial u/\partial P)_T$?

In another question, I asked about the theoretical justification for the experiment that I will describe in what follows. The experiment was done by Rossini and Frandsen in 1932 at the National Bureau ...
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### Dewpoint of water in relation to composition of atmosphere

A couple of colleagues and I were talking about the nature of dewpoints, specifically the dewpoint of water in relation to the chemical composition of the atmosphere in a closed space. If I remember ...
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### When a gas is expanded, why doesn't the number of moles of a gas increase despite it's volume increasing? [closed]

This question might be elementary, but it is genuine. I realise that some users might downvote the question for being so basic, but I urge them to be a little merciful, and help out a confused high ...
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### Validity of ideal gas law for pure species or mixture

I'm currently dealing with an application involving gases. I have pure nitrogen as a pressurizer and eventually water vapour (only if condition for evaporation or boiling are met). I wanted to ask to ...
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272 views

### Pressure in Boyle's law

According to Boyle's law, PV = k as long the temperature and amount of gas remain constant. In this equation, Is P the pressure inside the container or outside? I'm confused because I just saw a video ...
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250 views

### Can a heated gas leave a container through downwards direction?

If I have a flask full of heated gas, with an opening at the BOTTOM of the flask and connected pipe facing downwards, can the heated gas can leave the flask through that opening? And for an alternate ...
50 views

### Dissolution of CO2 over time in a high pH solution

I asked this question in the biology stack-exchange but thought it might be more appropriate here. I am running a batch experiment using penicillin bottles where I have bacteria growing for 21 days in ...
267 views

### If I make CO2 by exposing CaCO3 to HCl, how much of it would be dissolved in the water [closed]

For an experiment we're trying to measure the amount of gas produced in this reaction. But we always find less gas then expected, then a colleague told me that it could be because some of the CO2 ...
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1 vote
247 views

### How do I determine temperature and pressure rise whenever mols of gases are added in a isolated room?

Let's consider a fully isolated room, no gas or heat flowing from it. We consider gases ($\ce{O2,N2,CO2}$) to follow the ideal gas law, and no chemical reaction occurs between them. Pressure $p$, ...
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1 vote
124 views

### Scrubbing methanol and ethanol from a gaseous mixture

I have a gaseous mixture (air) at a temperature of approximately 30 degrees Celsius in which the following gases are present: Oxygen 0 - 25% Carbon Dioxide 0 - 20% Methanol 0 - 100 ppm? Ethanol 0 - ...
1 vote
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### If gaseous oxygen and dissolved oxygen (in water) have the same partial pressure, will they diffuse into solid materials at comparable rate?

To be specific, I am wondering about the dynamics of molecular oxygen diffusion into gas-permeable polymer materials, which is the sensing process of the optical oxygen probe (polymer-encapsulated ...
206 views

### RMS Speed of Gases as Standard Deviation

In kinetic molecular theory, the average velocity of gas particle is zero since the molecule move in different directions, and the overall effect is zero. Howeever, you can calculate different speeds. ...
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### According to PV=nRT,if we increase temp,no of moles will decrease,but no of moles is dependent on mass,mass is constant,then how can moles change?

We know the ideal gas equation is PV=nRT,then, according to this,if we keep Pressure,volume to be constant,then on increasing temperature,no of moles will reduce,this would mean that mass of matter or ...
42 views

### How can I find vapour properties of a compound molten salt?

I'm carrying out thermal-hydraulic simulations of the Aircraft Reactor Experiment (a nuclear molten salt reactor) based on circulating molten fuel salt: NaF 53 mol%, ZrF4 41 mol%, UF4 6 mol%. While ...
1 vote
125 views

### How do I go about calculating final temperature of tank draining at saturation?

I am working on calculating pressure in a tank where the fluid is sitting at its vapor pressure. For example, imagine a 12 in diameter 100 L tank of nitrous oxide at room temperature (745 psi vapor ...
1 vote
269 views

### How to shift SO3/SO2 equilibrium?

I am struggling with a chemical equilibrium question and would appreciate some help. The question involves a closed system where the equilibrium $$\ce{2SO2(g) + O2(g) <=> 2SO3(g)}$$ has been ...
151 views

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### Confusion in Van der Waals Equation

I understand that the behavior of ideal gases deviates largely from that of real gases in terms of pressure exerted by the gas molecules on the container in which it is present, space available for ...
1 vote
381 views

### Why is the excluded volume in van der Waals 4 times the actual volume of the gas molecule?

I am having trouble understanding why the excluded volume of a particle is four times its actual volume. According to Wikipedia, "The excluded volume b is not just equal to the volume occupied by ...
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### How do you calculate the heat capacity ratio for a multi-compound gas?

Let's say I have a heat capacity ratio of 1.4 N2 and a heat capacity ratio of 1.2 for O2 (just random placeholder values no significance), and I wanted to calculate the heat capacity ratio of their ...
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