All Questions
Tagged with equilibrium gas-laws
43
questions
1
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4
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246
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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 $p$, ...
- 31
-4
votes
1
answer
626
views
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 ...
- 3
1
vote
1
answer
260
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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 ...
- 11
1
vote
2
answers
90
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Find the percentage of dissociation of nitrogen tetroxide given pressure, temperature, enthalpy and entropy
Given
$$
\begin{align}
\Delta_\mathrm f H^\circ(\ce{N2O4}) &= \pu{9.16 kJ mol^-1}
&\quad
\Delta_\mathrm f H^\circ(\ce{NO2}) &= \pu{33.18 kJ mol^-1}
\\
S^\circ(\ce{N2O4}) &= \pu{304.3 ...
- 53
3
votes
1
answer
322
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Dissociation of phosphorus pentachloride in gas syringe
Phosphorus pentachloride is introduced into an empty gas syringe which has a movable, tightly-fitting plunger. The gas is allowed to expand until equilibrium is reached at a temperature at which the ...
- 65
-3
votes
1
answer
537
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How to calculate Kp without knowing the volume? [closed]
I have the following chemical equation:
$$\ce{Sb2S3 + 3H2 <=> 2 Sb + 3H2S}$$
I have $\pu{1000 grams}$ of $\ce{Sb2S3}$ that reacts with $\pu{10 grams}$ of $\ce{H2}$ in a reactor at $\pu{713 K}$.
...
2
votes
1
answer
220
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Partial pressure of gases in a container with a piston
I've been having problems with the following problem.
Figure 1.
A container with a piston like that shown in Figure 1 is filled with $0.10$ $mol$ of Ar and $1.00$ $mol$ of water (liquid and vapor). ...
- 605
1
vote
1
answer
138
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Equilibrium composition of methane–water system under given conditions
Calculate the equilibrium composition of a reactive system consisting of an equimolecular mixture of $\ce{CH4}$ and $\ce{H2O}$ at $\pu{900 K}$ and $\pu{1 atm},$ considered to be an ideal mixture of ...
- 21
6
votes
1
answer
459
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Can potassium carbonate be used to calibrate hygrometers?
Context:
In the process of trying to calibrate a number of hygrometers, with Sensirion MEMS electronic sensors, I came across the method of using wet salt: an airtight container will stabilize at a ...
- 163
1
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0
answers
47
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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 ...
- 27
3
votes
0
answers
125
views
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 ...
3
votes
1
answer
408
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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 ...
- 605
6
votes
0
answers
67
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Using Le Chatelier's Principle to Change Mechanical Energy to Chemical Energy
I was interested in an application of Le Chatelier's principle, where an increase in pressure could result in a decrease in the moles of gas.
In particular, a situation where when the pressure ...
- 169
2
votes
2
answers
1k
views
Calculating partial pressure of carbon monoxide
$\ce{ZnO}$ is exposed to pure $\ce{CO}$ at $\pu{1300 K}$ and the equilibrium
$$\ce{ZnO(s) + CO(g) <=> Zn(g) + CO2(g)}$$
is then established at $\pu{1 atm}$ pressure. The density of the gas ...
- 224
1
vote
0
answers
39
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Saturation dissolved oxygen level at pressure
The saturation level of dissolved oxygen in contact with a moist atmosphere is
$$c = 0.21(p_\mathrm{atm} - p_\mathrm{vap}) K_\mathrm{H} M$$
where the $p_\mathrm{atm}$ and $p_\mathrm{vap}$ are the ...
- 151
0
votes
2
answers
133
views
Molarity Numerical on Water Gas Shift Reaction
For the water gas shift reaction below, $K_c = 3.491$ at a certain temperature. What are the equilibrium concentrations of all the components of the reaction if $\pu{0.3815 mol}$ of $\ce{CO}$ and $\ce{...
2
votes
1
answer
143
views
How to calculate the standard Gibbs energy at equilibrium?
Given that $K_c = 1.7 \times 10^{-13}$, calculate $\Delta G^{\circ}$ for this equilibrium mixture at $\pu{298 K}$.
$$\ce{N2O (g) + \frac{1}{2}O2 (g) <=> 2 NO (g)}$$
I've calculated:
$$
\begin{...
- 131
1
vote
0
answers
98
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Determining mole fraction of carbon dioxide knowing Kp only
I've been assigned the following problem at school:
Given the following reaction:
$$\ce{C (s) + CO2 (g) <=> 2 CO (g)}$$
Find the mole fraction of $\ce{CO2}$ provided that, in equilibrium, $K_\...
- 21
0
votes
1
answer
1k
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Equilibrium constant from mole ratio
Chapter 4, problem 13 from the Chemical Priciples [1, p. 170]:
Equilibrium concentrations
Experiments have shown that at $\pu{60 °C}$ and $\pu{1 atm}$ total pressure, the equilibrium ratio of $\ce{...
- 111
1
vote
1
answer
156
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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 ...
0
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1
answer
232
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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 ...
user43021
0
votes
3
answers
765
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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 ...
- 11
0
votes
1
answer
2k
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Effect of increase in volume of container on concentration of chlorine at equilibrium conditions
How the concentration of the chlorine would be affected if the volume of the container is increased?
$$\ce{4 HCl + O2 <=> 2 Cl2 + 2 H2O + $Q$}$$
My initial thought was that the total and ...
- 19
2
votes
1
answer
154
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Concentrations of gases at equilibrium
The equilibrium constant for the reaction:
$$\ce{2NO(g) <=> N2(g) + O2(g)}$$
is $2.60 \cdot 10^{-3}$ at $\pu{1000^\circ C}$. If $\pu{0.820 mol}$ of $\ce{NO}$ and $\pu{0.223 mol}$ each of $\...
- 219
1
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2
answers
5k
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How to calculate the equilibrium constant from the density of a nitrogen dioxide and dinitrogen tetroxide mixture?
The density of an equilibrium mixture of $\ce{N2O4}$ and $\ce{NO2}$ at $\pu{1 atm}$ and $\pu{373.5 K}$ is $\pu{2.0 g/L}$. Calculate $K_c$ for the dissociation reaction
I did this:
Let initial amount ...
- 335
5
votes
2
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5k
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Finding the kp with density, temperature, and pressure
Consider the following reaction
$$\ce{3O2(g) <=> 2O3(g)}$$
At $\pu{175°C}$ and a pressure of $\pu{128Torr}$, and equilibrium mixture of $\ce{O2}$ and $\ce{O3}$ has a density of $\pu{0.168g/L}$. ...
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0
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0
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170
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How does Le Chatelier's principle apply to a fuel tank full of hydrogen?
A nano-tube packed fuel tank is full of Hydrogen, and there is a steady pressure of Hydrogen in the tank. While hydrogen gas is being removed from the fuel tank to power the car, the pressure in the ...
- 485
3
votes
1
answer
88
views
In a multi equilibrium system, how does change in one equilibrium affect the other?
Suppose in a reaction vessel of fixed volume we have the following equilibria established (existing simultaneously in the vessel),
\begin{align}
\ce{A (g) &<=> B (g) + C (g)}\tag{i}\label{i}\...
0
votes
0
answers
857
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Calculating volume % in a mixture of gases at equilibrium
In a mixture of $\ce{N2}$ and $\ce{H2}$ initially In a mole ratio of $1:3$ at $\ce{30 atm}$ and $\pu{300^\circ C}$, the percentage of ammonia by volume under the equilibrium is $17.8$. I have to ...
- 330
0
votes
4
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3k
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Is vapour pressure of a liquid solution constant at a given temperature, no matter the size of closed container and amount of liquid taken?
Does vapour pressure of a liquid solution depend on the size of the closed container, the amount of solution taken, given that, the temperature is kept constant? Or will it change if some extra gas is ...
- 151
1
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0
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125
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Find Equilibrium Constant with only balanced equation?
Calculate the value of $K_p$ for the following equation:
$$\ce{PCl3 (g) + Cl2 (g) <=> PCl5 (g)} ,\qquad \mathrm{R = 0.0821 \frac{L\times atm}{mol\times K}}$$
This question appeared on my test. ...
- 21
1
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1
answer
118
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Do perfect gases react when placed in a container whose volume can vary?
Suppose that $n$ moles of four generic perfect gases are made to react in a container, whose volume can vary, at a constant temperature and pressure, according to the formula
$$\ce{A(g) + B(g)<=&...
- 172
0
votes
1
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2k
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How can I calculate the percentage of dissociated dinitrogen tetroxide?
When $\pu{36.8 g}$ $\ce{N2O4(g)}$ is introduced into a 1.0-litre flask at $\pu{27 °C}$ the following equilibrium reaction occurs: $\ce{N2O4(g) <=> 2NO2(g)}$; $K_p = 0.1642~\mathrm{atm}$.
Find ...
- 371
1
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2
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2k
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Addition of inert gas at "constant volume"?
My textbook states that
"The addition of inert gases at constant volume does not affect the equilibrium state of the reactants and products contained in that volume."
Although I am not ...
user33789
7
votes
1
answer
126
views
Arterial blood CO2 content, division and partial pressure
My lecturer cites Boron and Boulpaep's Medical Physiology (2nd edition) for the following claims:
the total $\ce{CO2}$ content of arterial blood is $26.4$ mmol/L or $48\%$ v/v (not sure if these ...
- 477
5
votes
1
answer
138
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Pressure of carbon dioxide due to two simultaneous equilibriums
$1~\mathrm{mol}$ each of barium carbonate and calcium carbonate are put in a closed vessel which is maintained at $300~\mathrm{K}$ temperature. Two equilibria are established, with the respective ...
- 7,804
3
votes
2
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1k
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Resultant temperature of mixture
**Question: ** There are 2 flasks of equal volume, connected by a narrow tube of negligible volume, filled with nitrogen gas. When both are immersed in boiling water, the gas pressure inside the ...
- 542
4
votes
2
answers
11k
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Gas Pressure and Molecular Mass
The ideal gas equation (or the van der Waals equation, for this matter) states that holding volume and temperature constant, increasing the number of moles of particles in the container will increase ...
- 1,529
1
vote
0
answers
55
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Addition of inert gas to equilibrium mixture under constant pressure [duplicate]
Adding inert gas under constant volume will not disturb equilibrium. But I want to know what would happen if inert gases are added at constant pressure.
If total pressure remains constant and inert ...
- 7,804
1
vote
1
answer
84
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Concentration of expanding gases
At $t = 0$ we have 10 moles of $\ce{NO2}$ and 10 moles of $\ce{N2O4}$ satisfying this reaction in a 0.75 liter tank (the barrier is closed at this time):
$$\ce{N2O4 <=> 2NO2}$$
The system is ...
- 267
4
votes
1
answer
254
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Where does this equation for the activity in the gas phase equilibrium between N₂, H₂ and NH₃ come from?
I have a question with Equilibrium Constant.
I understand that for a reaction in equilibrium $aA +bB \rightleftharpoons cC +dD$
$$K_c= \frac{[C]^c[D]^d}{[A]^a[B]^b}$$
and $K_p$ is just using the ...
- 213
1
vote
1
answer
364
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Does Le Chatelier's principle apply to the gas inside an air mattress?
While sleeping on an air mattress yesterday a thought occurred to me. I had to re-inflate the air mattress since it was getting rather low and after it had a good stiffness to it, I went to sleep. The ...
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2
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How much carbonation is in one liter of commercial fountain Coca-Cola
From what I understand generally Coke is carbonated to roughly 6.2 g per liter in bottles and cans, or 3.1 volumes of CO2. I was watching this video because I was curious about how fountain soda ...
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