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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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How is Amagat's law applicable for ideal gases?

How/Why is Amagat's law applicable for ideal gases? Since the molecules of gas occupy negligible volume then logically for a mixture of ideal gases each gas in the mixture should have volume equal to ...
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17 views

The reference point used in Manometer equations [on hold]

Could someone clarify for me why h is determined from the lower liquid level to the higher lower level instead of say the bottom center of the bend?
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16 views

What will be the pressure at STP?

A vessel contains 14 gram of hydrogen and 96 gram of oxygen at STP. Now to calculate partial pressure of hydrogen --> $P_{H_2}=\frac{RT}{V_{m_{H_2}}}$ (here $V_{m_{H_2}}$ is molar volume of $H_2$...
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Robert Boyle's J-tube experiment - Difference in height?

Shown in the image above, in the equation K = V x P , P = Atmospheric Pressure + Difference in height of columns of mercury. I simply don't understand why that difference matters. I thought only the ...
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1answer
20 views

Heat generation in exothermic reactions [duplicate]

Im thinking specifically of N2 + 3 H2 ⇌ 2 NH3. Its an exothermic reaction, therefore heat is generated. Im trying to understand how Chateliers principle interacts with this reaction. I understand that ...
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0answers
30 views

Proof for equation of state for moist atmosphere [closed]

If $e$ and $p$ are vapor pressure of water and total pressure of moist air respectively, then the equation of state for moist atmosphere can be written as $$PV = RT[1 + 0.62 \frac{e}{p}]$$ Can anyone ...
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1answer
28 views

What percentage of a 20 volume solution is actually hydrogen peroxide? [closed]

Not too sure how to go about answering this question. I know that volume Strength is the volumes of O2 released on the decomposition of one volume of H2O2 at STP. However, I'm not certain where to go ...
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1answer
34 views

Сould you tell me, Henry's law depends on curvature of gas/liquid interface or not?

Could you tell me Henry's law depends on curvature of gas/liquid interface or not? It would be better with references. Thank you!
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38 views

How was it possible to accurately measure the mass of gases in the 19th century?

I have seen periodic tables of Mendeleev (1834-1907) and Newland (1837-1898) in which masses of gases such as oxygen and nitrogen were shown. I don't think there were instruments to measure mass of ...
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46 views

Stoichiometry question regarding Kp and amount

$$\ce{2 NH3 (g) -> N2 (g) + 3 H2 (g)}$$ I know the reaction, temperature (600 Celsius), pressure (1 bar), $K_p$ (equilibrium constant regarding pressure)=16,76, and initial $mol_{reactant}$=1 mol. ...
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1answer
274 views

Final pressure of an ideal gas mixture, when two separate gases are put into one vessel

At constant of 200 cm³ of $\ce{N2}$ at 720 mmHg and 400 cm³ of $\ce{O2}$ at 750 mmHg are put together into one litre flask. The final pressure of the mixture is: My question is how to use ideal gas ...
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1answer
50 views

Is there a better model than the Kinetic Theory of Gases [closed]

I'm looking for a better relationship between the Kinetic energy of a gas and it's Temperature, and also how they vary with gravity (not altitude, just gravity!). So is there a model better than the ...
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30 views

Is this the equation of state?

\begin{align} pn^{-\lambda} &= \text{constant} \tag1\label{eq:one}\\ pV^\lambda &= \text{constant} \tag{2, adiabatic equation} \label{eq:two}\\ n\left(\frac{l}{2}\right)\delta T &=...
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1answer
24 views

Dissolving of non polar gases in water (liquid)

How does dissolving happen for non polar gases in water? Is it like being in the space between the water molecules or does there occur some kind of interaction occur between gas molecules and water ...
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0answers
31 views

Total pressure conservation during equilibrium reaction

I tried to solve the following exercise but my solution is different from the one of the book and I can't understand why. The exercise is the following: With total pressure $$p_\text{tot}=\pu{0.5 ...
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1answer
6k views

Why can we still breathe in valleys? [duplicate]

Air is 1% argon. Argon is heavier than air. Why doesn't the argon concentrate in low-lying areas, choking out life there?
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1answer
23 views

Measure of partial pressure on blood

Here is the issue of blood gases partial pressure. On medical reports is common to see partial pressure of gas on blood, usually oxygen, but there is no gas in equilibrium with blood, so it is ...
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2answers
81 views

Volume of composition of air

My teacher stated: At standard conditions, 1 liter of air at 21% oxygen possesses $\pu{0.21 L}$ of oxygen. Since at STP, 1 mole of gas occupies $\pu{22.4 L}$, simply divide $0.21/22.4$, to arrive ...
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18 views

Gas concentrations along the gradient from sea level to deep-sea

Studying scuba diving-related phenomenas I thought about how to estimate gases concentration down the sea. Of course, solubility of gases at, for example, $5$ atm of pressure, can be estimated with ...
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1answer
42 views

How to apply Henry's law down the sea?

Background: Henry's law states that: At a constant temperature, the amount of a given gas that dissolves in a given type and volume of liquid is directly proportional to the partial pressure of ...
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4answers
78 views

Raoult's law & Dalton's law of partial pressures

I am confused between Raoult's law and Dalton's law of partial pressure as they state completely different things about same thing... Raoult's law claims $p = P \cdot x$ where $p$ is the partial ...
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1answer
414 views

Why is dp/dv zero for a real gas in critical conditions?

I have read this fact in various websites but cannot understand the reason. What is an intuitive explanation of this?
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41 views

Calibration Ammonia Sensor and Gas Concentration

My name is Felipe and this is my first post here. I'm working on a project to calibrate an electrochemical ammonia sensor. But I have a lot of doubts because I am a layman in chemistry. I'll list them ...
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2answers
38 views

Identifying an unknown gas using the Ideal Gas Law [closed]

So my chemistry teacher gave me this packet having to do with The Ideal Gas Law. One of the homework questions says, "An unknown gas at $\pu{20.0 ^\circ C}$ and $\pu{1900 torr}$ has a density of $\pu{...
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2answers
75 views

Avogadro's gas Law doesn't make sense? (it does actually)

It says equal volumes of all gasses under same conditions of temp. and pressure contains the same number of atoms/molecules. Now suppose you have 1L of Chlorine in a box and 1L Hydrogen in another ...
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1answer
71 views

Why does 1 mol. of any gas at STP occupy only 22.4L Volume when it should occupy the volume of entire container in which it is kept? [duplicate]

Let us say we have a container of 100L capacity and a gas inside it is kept at STP. According to the law the gas should occupy only 22.4L of volume but shouldn't the gas occupy the entire volume of ...
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1answer
23 views

Temperature of an aerosol can

Hey guys I just had a quick question regarding the temperature of a dust off can or other aerosol cans containing compressed gas. It is if I have a dust off can and I were to spray some gas from it, ...
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1answer
108 views

Trying to understand the contradiction in the data of Proust/Dalton/Berzelius vs Gay-Lussac

I am trying to understand some of the historical context behind the discovery of atoms (pre-Avogadro). In particular, I am getting stuck in reading the following documents: http://physics.unl.edu/~...
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1answer
28 views

Some thoughts about water-vapor cooking [closed]

Reading a Wikipedia article about latent heat, found: The large value of the enthalpy of condensation of water vapor is the reason that steam is a far more effective heating medium than boiling ...
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0answers
36 views

Effusion rate 1.4 times faster SO2(g)

How do I solve this- Which diatomic gas would effuse at a rate that is 1.4 times faster than the rate at which so2(g) effuses at any given temperature? This is high school chemistry. I did: (using ...
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2answers
667 views

Ideal gas Law best describes the properties of which of the following gases at 0 degrees Celsius and 1 atm? [closed]

a. $\ce{PH3}$ b. $\ce{HBr}$ c. $\ce{SO2}$ d. $\ce{N2}$ I believe that it is $\ce{N2}$, but I'm not too sure, since technically all of them would act the same at STP.
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178 views

Graph of compressibility factor vs pressure when real gas is assigned Z=1

Problem: According to the real gas equation, $Z = 1$ for an ideal gas and $Z$ is variable for a real gas. Suppose, in order to easy our calculations, we fixed $Z=1$ for a real gas and for ideal ...
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1answer
79 views

van der Waals equation for deviation of gases from ideal behavior

$(P + an^2/V^2)(V - nb) = nRT$ I understand that the term $nb$ is subtracted from the volume term as the available volume for the gas molecules to move around decreases in the case of a real gas ...
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74 views

Volume of gas in containers

If gases occupy all the volume in a container then how can we define 'volume percent' as all different gases will have same volume?
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36 views

Why isn't the sum of the volume of the reactants the same volume as product?

Imagine that we needed to work out the volume of $\ce{SO2 and O2 that would produce 0.180dm^3 of SO3}$ $$\ce{2SO2 + O2->2SO3}$$ By using Volume = Moles$\mathrm{~ \times 24 ~dm^3}$ We can ...
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Why does the temperature of a tyre rise when it is pumped up rapidly?

Why does the temperature of a tyre rise when it is pumped up rapidly? The way my textbook explains this is that $V\propto T$, so, an increase in volume causes an increase in temperature. However, I ...
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1answer
55 views

Flaw in my logic on Henry's Law?

It states mathematically $ p=Kx $ where $x$ is mole fraction of dissolved gas and $p$ is partial pressure of the gas. Dissolution of gases is exothermic, so with increase in temperature, solubility $x$...
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232 views

How to calculate the molarity of a gas?

If I have $X$ moles of a gas and I put them in a container at constant volume $V$, will the molarity of the gas then be $X/V$?
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133 views

Can pressure remain constant in isothermal expansion?

An ideal gas undergoes isothermal expansion at constant pressure. During the process: enthalpy increases but entropy decreases. enthalpy remains constant but entropy increases. enthalpy ...
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0answers
21 views

What is the real gas equation at high pressures? [duplicate]

Is it correct to ignore the $\frac{n^2a}{V^2}$ term at high pressures as is done? I think that, as pressure increases, this term also increases as Volume decreases so it is not safe to ignore it!
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316 views

How are the van der waal constants 'a' and 'b' related to molecular size?

'a' represents the measure of attractive forces between the gas molecules so how is it related to the molecular size? if a1> a2 then what does it tell us about the molecular sizes of 1 and 2?
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22 views

What temperature does oxygen have to be at to bond with carbon monoxide? [duplicate]

I was wondering how I would go about calculating the required temperature of oxygen to bond one oxygen particle with carbon monoxide (CO). I know that it depends on some other factors such as air ...
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2answers
109 views

Diffusion rate of gases

What is the effect of temperature on diffusion rate of gases? Do the diffusion rates of gases decrease with an increase in temperature? Why? I just read it somewhere that the diffusion rate of gases ...
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1answer
66 views

Theoretical comparison of critical constants of real gases

We know that for a real gas, its critical constants are: $T_\mathrm c=\frac{8a}{27Rb}$, attempt to $P_\mathrm c=\frac{a}{27b^2}$ and $V_\mathrm c=3b$. Now, let's compare the value of these critical ...
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finding out an known gas by determining its molecular weight through an experiment

A large evacuated flask initially has a mass of 134.567g . When the flask is filled with the gas of Unknown molar mass to 735 torr at 304K , it’s mass is 137.456g . When the flask is evacuated again ...
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Is there enough information in this question?

Here is the question: Some countries still measure liquid volumes in gallons. (1 gallon = 3.785 L). A test in America recently found that a certain car's engine produces on average 9.50 kg of $\ce{...
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1answer
1k views

Finding density of the gas mixture [closed]

A gas in a vessel is under pressure of $\pu{1800KPa}$. The design temperature of the tank is $\pu{423K}$. The gas consists of (by volume) $20\%$ of $\ce{CH4}$ and $80\%~\ce{N2}$. Estimate the density (...
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102 views

Pressure dependency in Haber Bosch ammonia synthesis

Haber-Bosch ammonia synthesis reaction: $$\ce{3H2 +N2 -> 2NH3}$$ According to the ideal gas law: $pV=nRT$ where constant volume implies $\displaystyle \frac nV=\frac p{RT}$ Then $\displaystyle ...
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45 views

Electrolysis under high pressure

Suppose we submerge a bell-shaped electrolysis chamber, flip it under water to have it filled with water, flip it again (so that the top is closed and the bottom is open), and lower it deep into weak ...
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618 views

How to filter out sulfur dioxide [closed]

Lets say I have a container that contains a mixture of air and sulfur dioxide. I want to be able to filter out the sulfur dioxide from the air, how can I do this either through the form of a filter or ...