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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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 ...
inventord's user avatar
-3 votes
2 answers
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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. ...
Laman Alipashayeva's user avatar
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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 ...
Shaurya Gupta's user avatar
1 vote
2 answers
121 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 ...
chemN00b's user avatar
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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 ...
The Entity's user avatar
-1 votes
1 answer
106 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,...
Yitian Chen's user avatar
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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 ...
Spluesh's user avatar
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2 answers
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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 ...
GMoss's user avatar
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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 ...
xoux's user avatar
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1 answer
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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 ...
Oak Staff's user avatar
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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 ...
Bongo Man's user avatar
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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 ...
Enrico's user avatar
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3 answers
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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 ...
Spluesh's user avatar
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-2 votes
1 answer
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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 ...
user137670's user avatar
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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 ...
Franco Grosso's user avatar
-1 votes
1 answer
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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 ...
Thomas's user avatar
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1 vote
4 answers
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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 $p$, ...
Aya's user avatar
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1 answer
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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 - ...
DenmarkViking's user avatar
1 vote
1 answer
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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 ...
GradStudent_BME's user avatar
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1 answer
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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. ...
Starlight's user avatar
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Is the compression factor of a gas equal to Vm/Vm-b?

According to the definition, the compressibility factor is the ratio of the molar volume and the molar volume if the gas behaved as an ideal gas $$ Z = \frac{V_\mathrm{m}(p,T)}{V_\mathrm{m}^\pu{ig}(p,...
Nitin aditya's user avatar
-2 votes
2 answers
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How is the notion that gases expand to the containing volume fit with the concept of molar volume? [duplicate]

I have a question about the concept of molar volume of a gas, which is defined as the volume occupied per mole of molecules of the gas. I don't know details about what a gas is at a deep level, but ...
xoux's user avatar
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4 answers
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How to obtain the value of the gas constant R = 8.20574 × 10⁻² L atm K⁻¹ mol⁻¹

While reading a chemistry book, I saw a table of values of the gas constant for different units. For example, $$R=8.20574\times 10^{-2}\ \text{L}\cdot\text{atm}\cdot \text{K}^{-1}\cdot \text{mol}^{-1}\...
xoux's user avatar
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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 ...
Aakash's user avatar
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2 votes
0 answers
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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 ...
Ruggero Rosselli's user avatar
1 vote
1 answer
117 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 ...
Alexander Patrus's user avatar
1 vote
1 answer
229 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 ...
cricket900's user avatar
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0 answers
150 views

Find volume of methanol produced via reaction between carbon monoxide and hydrogen gases

Methanol is manufactured by the reaction of carbon monoxide gas with hydrogen gas. If a $95~\%$ yield is usually obtained, approximately how many liters of hydrogen gas at $\pu{350 °C}$ and $\pu{300 ...
Jane902's user avatar
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3 votes
2 answers
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My experiemental density of H2 does not match the published data. What causes this discrpenecy?

I placed 1 gram of NaBH4 in a balloon and placed it over a glass round bottle filled with water and acetic acid. While secured, I emptied the balloon into the bottle and made sure to wash the inside ...
Lambda's user avatar
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2 answers
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In combustion method for analysing molecular formula of gaseous hydrocarbon, is pressure of the gaseous mixture always constant?

I understand the we have to look at the volumes, but the fact that volume of a gas is directly proportional to the number of moles of the gas holds only at constant pressure. Also we are applying Gay-...
R.Roy's user avatar
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0 votes
2 answers
158 views

In gas law equations, if volume and temperature are directly proportional, why can't we write the equation as temperature divided by volume? [closed]

In gas law equations, volume, temperature, pressure and amount of substance may vary. In the simpler equations, like Charles' and Amonton's, temperature and pressure/volume are directly proportional. ...
suse's user avatar
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5 votes
2 answers
224 views

Dalton's law clarification

I'm looking at Elements of Physical Chemistry by Atkins and de Paula. In section 1A.3, they state Dalton's law as The pressure exerted by a mixture of perfect gases is the sum of the pressures that ...
scmartin's user avatar
1 vote
1 answer
131 views

Is oxyhydrogen lighter than air?

And, if so, how much lift does it produce per cubic meter? (let's say at 290ish K and 150 meters above sea level) For context, I'm taking an intro-level physics class. While I know what a joule is, I ...
maximus's user avatar
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0 answers
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What ideal gas behavior is observed by a real gas that observes Boyle's law (at Boyle's temperature)?

Boyle's temperature is a constant for a particular gas. At this temperature the real gas behaves ideally. So, does the real gas only follow Boyle's law at this temperature, or are all the gas laws ...
csebks's user avatar
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1 vote
2 answers
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Find the percentage of dissociation of nitrogen tetroxide given pressure, temperature, enthalpy and entropy

Given $$ \begin{align} \Delta_\mathrm f H^\circ(\ce{N2O4}) &= \pu{9.16 kJ mol^-1} &\quad \Delta_\mathrm f H^\circ(\ce{NO2}) &= \pu{33.18 kJ mol^-1} \\ S^\circ(\ce{N2O4}) &= \pu{304.3 ...
Acedium 20's user avatar
3 votes
0 answers
47 views

How to calculate composition of alcohol/water mixture to achieve given concentration of alcohol vapors in air for calibrating a DIY breathalyzer?

I made a breathalyzer using a MiCS-5524 gas sensor. I would like to calibrate it so it can be close to accurate. e2v technologies — MiCS Application Note 4, Using MiCS Sensors for Alcohol Detection (...
Bill2k's user avatar
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2 votes
1 answer
275 views

Does carbon dioxide come out of solution on freezing?

Years ago in a lab where I was working someone had the excellent idea of cooling down their can of coke by pouring liquid nitrogen over it. The can exploded and resulted in quite a mess. My question ...
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GLP mass to volume conversion problem (Rotary Meter)

this is my first post here on this forum. I would like to share a question that is bothering me: I have a gas powered system. I would like to measure the total gas consumption in ...
Felipe Quadros's user avatar
-4 votes
1 answer
66 views

What happened after fire finished burning? [closed]

After fire finished burning, did it merge with the atmosphere and becoming water vapors, oxygen and nitrogen, or did it simply disappear into nothing?
SnoopyKid's user avatar
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-1 votes
1 answer
258 views

Can we calculate final temperature of two gases in thermal contact? [closed]

This is a question from IIT-JEE - ADVANCE 2018 A closed tank has two compartments A and B, both filled with oxygen (assumed to be ideal gas). The partition separating the two compartments is fixed ...
Paras Gupta's user avatar
-2 votes
2 answers
681 views

Why is real volume not smaller than ideal volume in the van der Waals gas equation correction terms? [duplicate]

The following equation is valid for ideal gases $$pV=nRT$$ Please mind the following notation, any parameter that is related to an ideal gas would be denoted with a subscript $i$ and anything related ...
Subhadip Kar's user avatar
8 votes
1 answer
718 views

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 ...
anotherhyooman's user avatar
1 vote
2 answers
323 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 ...
Pumpkin_Star's user avatar
4 votes
2 answers
3k views

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 ...
one two's user avatar
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0 votes
1 answer
375 views

How would one calculate the Heat Capacity Ratio for a multiple compound Gas?

So I'm attempting to calculate the heat capacity ratio (known also as adiabatic index) of a gas with several concentrations of different compounds such as N2, H2O, CO2, CH4 etc. And while I have an ...
one two's user avatar
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0 answers
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How to calculate corrected Gas Volume?

We are working on a project called 'Electronic Gas Volume Corrector'. The device reads pressure and temperature from sensors mounted on a gas pipe and gas volume from a gas meter. These are the ...
Issam H's user avatar
1 vote
1 answer
373 views

Why is the value of the heat capacity ratio γ the same for molecules with the same atomicity?

The heat capacity ratio is defined as the ratio of the heat capacities at constant pressure and volume respectively: $$\gamma = \frac {C_p}{C_V}\tag{1}$$ Then obviously $$\gamma = \frac{n\,C_p\,\Delta ...
theawesomenerd's user avatar
0 votes
1 answer
625 views

Cubic nature of van der Waals' gas equation

$V_m^3-\dfrac{RT+bP}{P}V_m^2+\dfrac{a}{P}V_m-\dfrac{ab}{P}=0$ So, At $T<T_c$ the above equation has three real roots say $V_1,V_2,V_3$, my doubt is what does this mean physically because for some ...
Akshaj Bansal's user avatar
1 vote
1 answer
245 views

Can general purpose compressors be used for a specific gas without modification?

Air compressors are commonly used for all sorts of purposes related to compressing air above 1 atm. My question is, could an air compressor be used for a specific gas without modification? For example,...
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0 answers
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Why should the cubic equation in volume, obtained from Van Der Waals equation of state, have equal roots at the critical point?

The video Edmerls — Derive Equation for Critical Constants in terms of Vander Waal's Constants. | Physical Chemistry (YouTube) provides a derivation of the relationship between the van der Waals ...
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