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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48 views

Find gas pressures of injection knowing mixture pressure without knowing volume

Let's say we have a gas 1 moving inside a pipe (we don't know the geometry) at mass flow rate $Q_1$ and temperature $T_1.$ We inject a gas 2 at some point inside the pipe with gas 1 at mass flow rate $...
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1answer
45 views

Using PV = nRT to solve an electrolysis problem

Question: Two electrolytic cells are connected in series (the same current passes through each cell). One cell for the electrolysis of water produces $\pu{100 cm^3}$ of oxygen, measured at $\pu{273 K}$...
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1answer
32 views

can ozone run upwards through a silicon tube and exit against gravity?

I want to get ozone into an attic where rats are running around. For some reason, the attic is inaccessible to us. I ordered a bubbling ozone unit. We will drill a hole into the attic and run the ...
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0answers
13 views

The influence of carbon dioxide concentration on microalgae growth rate [closed]

I'm doing an experiment on the influence of carbon dioxide concentration on microalgae growth rate. In this experiment, I have CO2 cylinder and gas mixer. How to decide CO2 concentration by using both ...
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2answers
37 views

Isobaric entropy relation from isothermal Gibbs free energy relation

I have been given a problem to derive a relation for change in entropy from change in Gibbs free energy: Starting with the isothermal equation $$G(p_2) = G(p_1) + nRT\ln\frac{p_2}{p_1}\label{eqn:1}\...
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2answers
63 views

Finding the percent volume of each gas in the gas mixture [closed]

A gas mixture of $\ce{H2}$ and $\ce{N2}$ weighs $\pu{2.00 g}$ and have a volume of $\pu{10.0 L}$ at $\pu{700 mmHg}$ and $\pu{63.0 °C}$. Calculate the vol.% and the partial pressures of the two gases ...
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1answer
32 views

Purging submersible with nitrogen

I do a lot of short term ocean field deployments where system electronics are self contained in a submersible enclosure. A new project I'm working on requires a long term deployment in the deep ocean. ...
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0answers
18 views

adiabatic reversible process problem

A compressor recieved air at To= 300 K and at pressure Po= 1 atm. At the exit, P1 = 2 atm. The process inside the compressor is (A) adiabatic and reversible (B) gas is an ideal gas (3) gamma = Cp/Cv = ...
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1answer
145 views

Help with two containers problem, Xenon

In two containers we have Xenon. The volume of the first container is 2780 L, temperature is 300 degree Celsius, and n = 200 mol. Volume of the second container is 4000 L, temperature is 1300 degrees ...
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3answers
61 views

Specific Heats for Non-Constant Processes

Why can the specific heat at constant Pressure ($C_p$) be used to calculate the change in enthalpy as $\text{d}H = C_p\text{d}T\newcommand{\d}{\text{d}}$ for processes that are not even at constant ...
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1answer
165 views

Why are these two methods of converting from ppm to g/m3 equivalent?

I've found two methods to convert from $ppm$ to $g/m^3$. They both appear to give equivalent results, but I don't understand why. Can anyone join the dots for me and explain why they are equivalent ...
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1answer
80 views

Volume of ideal gas molecule [closed]

Is there any reason as to why we assume the volume of ideal gas to be negligible in comparison to the container? What is the underlying reason to assume that the ideal gas molecules are point ...
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0answers
14 views

HCl Concentration vs HDPE Permeation

I've learned that HCl escapes HDPE. I looked up why and it turns out it's because of the small size of the molecule. That factor is unlikely to be affected by the concentration of HCl in water, but I ...
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2answers
29 views

Precise estimation of air properties as a function of temperature at 1 atm

Are there any tables with empirical equations to calculate properties of air as a function of a temperature at 1 atm? For example, NIST provides such equations for a large number of gases, but I was ...
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1answer
97 views

How does one prove Avogadro's law from Gay-Lussac's?

To understand Gay-Lussac's law, Amedeo Avogadro said In equal volumes of air under constant temperature and pressure, there are equal number of atoms (or molecules). Let's take a hydrogen and an ...
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1answer
39 views

Question regarding $Z$ (Compressibility factor)

Oh! This problem has been bugging me for a long time. According to Wikipedia, the Compressibility factor $Z$ is defined as the ratio of the volume occupied by a real gas to the volume occupied by an ...
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2answers
70 views

How is this possible in mole concept? [closed]

L = $6.022*10^{23}$ If I have one atom of oxygen , it has exactly L value. Now 2 atoms of a oxygen have 2L value.(Note that I mean 2O and not $O_2$here) Well , if we take a molecule made up of 2atoms ...
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0answers
42 views

Dynamic viscosity of gas mixture (appropriate estimation)

What estimation of the dynamic viscosity $\eta = f(T)$ $([\eta] = \pu{Pa·s})$ of the gas mixture components would you recommend during adsorption at a low temperature, approx. $\pu{293 K}$ to $\pu{333 ...
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1answer
124 views

Will CO2 bubbles ever fully dissolve in water?

Background: Many aquarists keeping freshwater planted tanks add $\ce{CO2}$ from a pressurized canister to their aquaria to promote plant growth. Injection is at a slow rate to get dissolved $\ce{CO2}$ ...
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1answer
38 views

Work done by system of ideal gas in isobaric expansion

Consider a system of ideal gas in a container with piston and the isobaric expansion of gas takes place. As the process is isobaric, so initially the pressure of gas is equal to atmospheric pressure ...
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1answer
22 views

Molar Mass & Pressure-Volume Relationship [closed]

How do differences in molar mass affect the pressure-volume relationship between four different gases?
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65 views

Volume of compressed helium gas needed for FE test on ball valves

I'm currently doing a case study to find out the exact volume of helium gas required for FE tests on ball valves regards to the valves' volume and pressure class and the number of helium tanks needed ...
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4answers
455 views

Explanation for a basic decomposition of water experiment

My son is trying to write a conclusion for a basic decomposition of water experiment using a 9 V battery (with a test tube placed over each terminal) placed inside a salt water solution. The results ...
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2answers
204 views

Sign of work done by gas during isothermal expansion

$\pu{10 mol}$ of an ideal gas confined to a volume of $\pu{10 L}$ is released into atmosphere at $\pu{300 K}$ where the pressure is $\pu{1 bar}.$ The work done by the gas is: Work done can be found ...
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2answers
96 views

Fermentation of glucose

I have trouble understanding as to what the last part of the increase in liquid level means. I believe this is the foam formed after the fermentation? I am calculating for the pressure but I have ...
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0answers
25 views

A question on approximate equation for 2 gases and liquefiable nature

While learning the gaseous state I stumbled upon a question which I don't think has correct answer according to my booklet. Question:The following equations are occasionally used for approximate ...
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2answers
143 views

Using the mass of calcium carbonate, what volume of carbon dioxide could theoretically be obtained if the reaction progressed to completion?

Using the mass of calcium carbonate $m(\ce{CaCO3}) = \pu{0.500 g}$, what volume of carbon dioxide $V(\ce{CO2})$ (in $\pu{mL})$ could theoretically be obtained if the reaction progressed to completion? ...
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1answer
39 views

interconverting Van Der Waal's equation for real gases from number of molecules to density

I want to ask a question about Van Der Waal's equation for real gases. I was shown the following formula for real gases (VDW) which accounts for the liquification of water vapour which is not possible ...
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1answer
46 views

How to get equation of state from fugacity

Given that the fugacity of a substance is $f=Pe^{bT}$, how do I obtain the equation of state of the substance? This is my approach, but I have not made good headway: $$RT d (\ln f) = VdP \\ d(\ln f) = ...
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1answer
40 views

NaHCO3 decomposition dynamics and extent vs Temperature

I'm wondering approximately how fast and to which extent $\ce{NaHCO3}$ will decompose (to $\ce{CO2}$ and $\ce{H2O}$) at $50$, $60$, $70$, $80$, $90$, $100$, $110$, $120$, and $\pu{130 ^\circ C}$. It ...
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1answer
61 views

Finding concentration of hydronium ions in water after adding hydrogen chloride gas [closed]

A sample of hydrogen chloride gas, $\ce{HCl}$, occupies $\pu{0.932 l}$ at a pressure $\pu{1.44 bar}$ and at a temperature of $\pu{50^\circ C}$. The sample is dissolved in $\pu{1 l}$ of water. What is ...
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1answer
190 views

Textbook problem with molar mass of carbon dioxide

$\ce{K2CO3}$ and $\ce{HCl}$ react to produce $\ce{CO2}$. In an empty flask ( m = $\pu{85.431 g}$ ) we put in the produced gas and the mass of the flask is now $\pu{85.510 g}$. After that we fill the ...
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0answers
40 views

Calculating the number of volatile molecules in a container of known volume [closed]

Is it possible to calculate the number of volatile molecules (so only those in the gaseous phase) in a container of known volume, if the vapor pressure of the compound is known? So for example, if you ...
2
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1answer
39 views

Experiment to demonstrate Dalton's Law of Multiple Proportions

Is there an experiment that I can do in the lab with middle or high school students to demonstrate Dalton's Law of Multiple proportions ? For example, the reaction of $\ce{C}$ and $\ce{O2}$ to give $\...
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1answer
116 views

Can we convert nitrogen from the air into liquid nitrogen? [closed]

Is it possible to convert the nitrogen that surrounds us, into liquid nitrogen? If so, how? If not, why not? Thx
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1answer
75 views

Ideal gas equation derivation proportionality [duplicate]

While deriving the Ideal gas Equation using Boyle's, Charles', and Avogadro Laws, how are each of the laws, which have different proportionality constants and different quantities as constant combined?...
2
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1answer
47 views

What would the van der Waals parameters look like for gaseous metals?

So basically I'm trying to do some calculations on laser based machining, and it involved vaporizing a small mass from a target metal workpiece. I was assuming that a certain m mass of the metal ...
1
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1answer
264 views

What gas law is involved when your ears “pop” when you are on a plane high in the air? [closed]

When you are up in the air, the air pressure decreases and the altitude increases. What gas law is involved in the situation wherein your ears "pop" because of the difference in pressure.
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28 views

What is vacuum-assisted ultrasonication?

This quote from a methods section of a paper: [samples were] ultrasonicated for approximately 30 min to ensure adequate dispersion of the components throughout the mixture. The solution was then ...
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1answer
399 views

Adiabatic expansion of gas

If a real gas is adiabatically expanded against constant pressure, then which of the following will definitely increase? Compressibility factor (Z) or Entropy (S) Correct answer: Entropy My answer: ...
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3answers
790 views

Work done in Irreversible Isothermal Expansion

This is the graph for the Isothermal Expansion of an Ideal Gas. Sorry for the extremely basic doubt, but I just could not understand how the expansion was Isothermal if the graph was a straight line. ...
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2answers
104 views

Misconception of gas laws [closed]

I face a misconception with gas laws: Boyle’s law, Charles’ law, and Gay-Lussac’s law. This is because each law of these assumes the constancy of one of the three following variables (the pressure, ...
2
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1answer
55 views

Rigorous reason behind internal energy change being zero while mixing

A container is divided in two parts: one part contains oxygen gas $(n_1$ moles, at temperature $T_1)$ and the other part contains helium gas $(n_2$ moles, at temperature $T_2).$ The partition ...
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2answers
31 views

Crossing at critical temperature of a gas

This is written in the book 'Treatise on Thermodynamics' by Max Plank- the crossing of the critical temperature at any pressure other than the critical pressure differs in no way from the crossing of ...
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2answers
36 views

Calculating the molar volume of a perfect gas under standard ambient temperature and pressure [duplicate]

I am trying to calculate the molar volume of a perfect gas under standard ambient temperature and pressure, but I'm having problems with the units. $$\begin{align} V_m = \dfrac{RT}{p} &= \dfrac{(8....
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2answers
59 views

Can Gay-Lussac's law be observed in the reverse direction?

Gay-Lussac's law states that if you decrease the temperature of a gas at constant volume, the pressure decreases by a corresponding amount. This is easy to carry out experimentally. But in practice is ...
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0answers
253 views

What is the value of isothermal compressibility of a van der Waals gas at critical point?

For a van der Waals gas, isothermal compressibility is $$\kappa=\frac{V^2(V-nb)^2}{nRTV^3-2an^2(V-nb)^2}$$ If one substitutes the values of critical temperature and volume in this formula, isothermal ...
2
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0answers
55 views

How to convert pCO2 (uatm) in seawater to grams

I have seawater pCO2 measurements, and I need to convert them from uatm to moles or grams for around a 50m depth integration. I know the solubility coefficient and temperature among other data. For ...
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2answers
34 views

Doubt concerning Andrews Curve [closed]

In Andrews Curve of $\ce{CO2}$, what do the horizontal lines signify? I know that the gas changes to liquid in that region, but since the pressure and temperature is held constant, how does the gas ...
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0answers
24 views

How would you explain the Haber process in terms of Gas Laws?

I have to write a short paper on this and I understand what the haber process is but I am not to sure about how to explain it in terms of Gas laws. The only one I could think of was Charle's law by ...

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