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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Gas laws and stoichiometry, find the volume [closed]

How many liters of O2 gas at 1.25 atm and 25 C are needed to produce 10.0 grams of boric oxide by this reaction? (B=10.81g/mol, O=16.00 g/mol). Reaction: $$\ce{B2H6 + O2 -> B2O3 + H2O}$$ Note: I ...
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82 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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How to simulate mixing of gases with different compositions? [migrated]

Let's assume that we have the following apparatus in which volumes A and B are separated by a magical, impermeable, adiabatic barrier labelled S. (Let's also assume that the volumes are cubes, and ...
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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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Is it true that one atom does not form a molecule? [closed]

Here it states that one atom can form a molecule. Notice here that , one N and one O atoms are related
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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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33 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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83 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
35 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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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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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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426 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
122 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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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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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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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
37 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
45 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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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
60 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
187 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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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 ...
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1answer
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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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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
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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?...
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1answer
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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 ...
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1answer
158 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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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
202 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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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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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, ...
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1answer
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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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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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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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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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170 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 ...
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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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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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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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Ideal Gas equation and its Assumptions [duplicate]

The two assumptions are that the gases are points of mass that move, they have no volume and that there is no interaction between other molecules. But even the points of mass can collide with each ...
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1answer
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If the gaseous molecules didn't have any kinetic energy would the surface of a filled balloon still be firm? [closed]

The most of the ideal gas law equation is based on the fact that the gaseous molecules are moving around and cause collisions and thus have some pressure. If these molecules were to not have any ...
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Gas / Gas mixture dynamic viscosity temperature and pressure dependance

I’m trying to get an accurate interpretation of certain gases ($CO_2$, $N_2$, $NO$, etc.) dynamic viscosity [Pa.s] as a function of temperature and pressure (afterwards determine the dynamic viscosity ...
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Why does high blood gas partition coefficient of a inhalational anaesthetic drug mean slower induction of anesthesia?

High blood gas partition coefficient of a drug corresponds to higher solubility of the drug in blood leading to high concentration of the drug in blood with respect to gas (air in alveoli). If the ...
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1answer
141 views

Percent degree of dissociation of gas by pressure

I stumbled across the following interesting problem: Assume that you have started to live on a new planet where standard pressure condition is $\pu{2 bar}$, standard concentration is $\pu{1 M},$ and ...
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1answer
103 views

how much baking soda and vinegar will you need to fully fill a ziplock bag up without popping it? [closed]

EXACTLY how much baking soda and vinegar will you need to FULLY fill a ziplock bag up without popping it or it being deflated? I am really confused. That is all our teacher told us and he said that ...
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How to compute the pressure potential of the fermentation of sugar into carbon dioxide?

I'm doing an experiment to ferment table sugar with yeast to capture the resulting carbon dioxide. Suppose I put $x$ grams of sugar in a closed 1 liter bottle with yeast. How can I compute the ...
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1answer
64 views

What actually happens to the volume of a gas in an isolated system?

In an isolated system with adiabatic walls in which gas is filled what exactly happens? How do we define the volume of a gas here? Is volume of 1 mole of gas present in that inelastic container the ...
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1answer
37 views

Transformation of virial coefficients from molar volume to pressure

I have the following virial equation for a real gas: $Z = \frac{PV_m}{RT} = 1 + \frac{B}{V_m} + \frac{C}{V_m^2}$ I would like to transform the coefficients $B$ and $C$ so the equation is expressed ...
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100 views

What is the relative rate of diffusion of ammonia to hydrogen chloride, both in gaseous states? [closed]

I encountered this problem during an assignment: I answered it as C, but the assignment grader marked it as wrong and indicated that A is correct. I asked another instructor about it and gave me a ...
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Antoine law and ideal gas law

I have the following question: A $100\ \mathrm{ml}$ sealed flask with $60\ \mathrm{ml}$ acetonitrile is heated to $140\ \mathrm{^\circ C}$. The boiling point of acetonitrile is $82\ \mathrm{^\circ ...

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