All Questions
Tagged with equilibrium physical-chemistry
434
questions
6
votes
2
answers
479
views
Equilibrium constant vs Reaction rate constant
For a reaction, e.g.,
$$a X + b Y → c Z$$
Its reaction rate constant is
$${\displaystyle r=k_f(T)[\mathrm {X} ]^{m}[\mathrm {Y} ]^{n}}$$
where the exponents m and n are called partial orders of ...
- 81
1
vote
3
answers
199
views
Equilibrium constant for isothermal double equilibrium “shift”
I do not understand how the solutions to the following high school chemistry question are valid:
A $\pu{1 L}$ vessel containing $\pu{0.300 mol}$ of dinitrogen tetraoxide gas is allowed to come to ...
- 1,584
0
votes
0
answers
71
views
How to apply Le Chateliers' principle for the reaction between nitrogen and hydrogen to produce ammonia?
$\ce{N2 (g)}$ and $\ce{H2(g)}$ are allowed to react in closed vessel in given temperature and pressure for the formation of $\ce{NH3 (g)}$ according to,
$$\ce{N2 (g) + 3H2 (g) <=> 2NH3 (g) + \pu{...
- 169
1
vote
2
answers
90
views
Find the percentage of dissociation of nitrogen tetroxide given pressure, temperature, enthalpy and entropy
Given
$$
\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
2
answers
144
views
What happens to the hydroxide ion concentration when you add caustic soda to ammonia?
Question.
Find the $[\ce{OH-}]$ and the pH of a $\pu{0.20 M}$ $\ce{NH3}$. If given $\pu{1 L}$ of the previous solution, when adding $\pu{100 mL}$ of $\pu{0.2 M}$ $\ce{NaOH}$, what would be the new ...
- 53
1
vote
1
answer
149
views
Can an equilibrium be reached when there is an excess amount of one reactant over the other reactant? [closed]
For example, consider a net reaction between ferrous nitrate and potassium thiocyanate:
$$\ce{Fe^3+(aq) + SCN-(aq) <=> (SCN)^2+(aq)}$$
Can an equilibrium be reached if there is a much greater ...
- 81
1
vote
1
answer
80
views
What is the difference between a single displacement reaction and a two competing reaction system?
For example, consider the single-displacement reaction
$$\ce{AB + C <=> BC + A}$$
My question is then if writing this reaction as the system
\begin{gather}
\ce{AB <=> A + B} \\
\ce{B + C &...
8
votes
2
answers
514
views
Schlögl model - Stationary States far from Equilibrium
The Schlögl model can be represented as follows:
$$
A + 2X \underset{k_2}{\stackrel{k_1}{\rightleftharpoons}} 3X \, ,
\\
X \underset{k_4}{\stackrel{k_3}{\rightleftharpoons}} B \, .
$$
The chemical ...
- 183
3
votes
1
answer
255
views
How does pressure affect the color of reaction medium with equimolar amounts or reactants and products at equilibrium?
Chlorine gas is pale yellow-green, and both hydrogen and hydrogen chloride are colorless gases. According to the Le Chatelier's principle, the change in pressure will not affect the following ...
- 41
0
votes
1
answer
564
views
Degree of dissociation and conductance
My book says ratio of molar conductance at a given concentration of solute and molar concentration at infinite dilution is equal to degree of dissociation for weak electrolytes.
I understand it ...
- 1
2
votes
1
answer
59
views
Rate law for thermolysis at temperatures well above the decomposition temperature
If the temperature is higher than the decomposition temperature, are thermal decomposition reactions reversible? For example, which of the following schemes would be more appropriate for temperatures ...
- 21
0
votes
1
answer
58
views
Are there any well documented reactions with "persistent" intermediates
I'm a biology and/or math person, not a chemistry person. I have only taken the standard sequence of undergraduate courses up to organic chemistry, and that was some time ago, so please excuse (and ...
- 101
3
votes
1
answer
166
views
Why does the equation for chemical potential apply to liquids and aqueous solutes?
The equation for chemical potential of a gas can be derived as such:
At constant temperature,
$$\mathrm dG = V\,\mathrm dP \label{eqn:1}\tag{1}$$
Substituting with the ideal gas law $PV = nRT$,
$$\...
- 360
0
votes
0
answers
29
views
Is there an agreement for a specific temperature referred to in the context of standard Gibbs energy? [duplicate]
I found an exercise in Physical Chemistry by Atkins et al, 8th edition, page 235 that I found confusing. The question is as follows.
"7.2(b) Molecular bromine is 24 per cent dissociated at 1600 K ...
- 47
2
votes
1
answer
391
views
Electrode potential for saturated silver carbonate solution
An electrochemical cell is set up to measure the electrode potential $E(\ce{Ag^+}/\ce{Ag})$ using the saturated $\ce{Ag2CO3(aq)}$ solution $(K_\mathrm{sp}(\ce{Ag2CO3(aq)},\pu{25 °C}) = \pu{6.3E-12})$ ...
- 65