All Questions
19
questions
1
vote
2
answers
90
views
Find the percentage of dissociation of nitrogen tetroxide given pressure, temperature, enthalpy and entropy
Given
$$
\begin{align}
\Delta_\mathrm f H^\circ(\ce{N2O4}) &= \pu{9.16 kJ mol^-1}
&\quad
\Delta_\mathrm f H^\circ(\ce{NO2}) &= \pu{33.18 kJ mol^-1}
\\
S^\circ(\ce{N2O4}) &= \pu{304.3 ...
- 53
3
votes
1
answer
322
views
Dissociation of phosphorus pentachloride in gas syringe
Phosphorus pentachloride is introduced into an empty gas syringe which has a movable, tightly-fitting plunger. The gas is allowed to expand until equilibrium is reached at a temperature at which the ...
- 65
1
vote
1
answer
138
views
Equilibrium composition of methane–water system under given conditions
Calculate the equilibrium composition of a reactive system consisting of an equimolecular mixture of $\ce{CH4}$ and $\ce{H2O}$ at $\pu{900 K}$ and $\pu{1 atm},$ considered to be an ideal mixture of ...
- 21
3
votes
0
answers
125
views
Why does high blood gas partition coefficient of a inhalational anaesthetic drug mean slower induction of anesthesia?
High blood gas partition coefficient of a drug corresponds to higher solubility of the drug in blood leading to high concentration of the drug in blood with respect to gas (air in alveoli). If the ...
3
votes
1
answer
408
views
Percent degree of dissociation of gas by pressure
I stumbled across the following interesting problem:
Assume that you have started to live on a new planet where standard pressure condition is $\pu{2 bar}$, standard concentration is $\pu{1 M},$ and ...
- 605
2
votes
2
answers
1k
views
Calculating partial pressure of carbon monoxide
$\ce{ZnO}$ is exposed to pure $\ce{CO}$ at $\pu{1300 K}$ and the equilibrium
$$\ce{ZnO(s) + CO(g) <=> Zn(g) + CO2(g)}$$
is then established at $\pu{1 atm}$ pressure. The density of the gas ...
- 224
1
vote
0
answers
39
views
Saturation dissolved oxygen level at pressure
The saturation level of dissolved oxygen in contact with a moist atmosphere is
$$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
0
votes
1
answer
1k
views
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
0
votes
3
answers
765
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 ...
- 11
2
votes
1
answer
154
views
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
vote
2
answers
5k
views
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
0
votes
0
answers
170
views
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}\...
