Question
Establish the relationship between Gibbs energy change and equilibrium constant.
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- At 473K, equilibrium constant, K for decomposition of PCl5 is 8.3 × 10-3. If decomposition is depicted as
$\text{PCl}_5(\text{s})\rightleftharpoons\text{PCl}_3(\text{s})+\text{Cl}_2(\text{g});$
$\Delta_\text{r}\text{H}^\text{o}=124.0\text{kJ mol}^{-1}$
- Write an expression for Kc for the reaction.
- What is the value of Kc for the reverse reaction at same temperature.
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- The pressure is increased?
- The temperature is increased?
- Write equilibrium constant for the following reactions:
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$\text{BaCO}_3(\text{s})\rightleftharpoons\text{BaO(s)}+\text{CO}_2(\text{g})$
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$\text{CH}_4(\text{g})+2\text{O}_2(\text{g})\rightleftharpoons\text{CO}_2(\text{g})+2\text{H}_2\text{O(g)}$
Match the ions given in Column I with their nature given in Column II.
→| | Column I | | Column II |
| (i) |  | (a) | Stable due to resonance. |
| (ii) | $\text{F}_3-\text{C}^\oplus$ | (b) | Destabilised due to inductive effect. |
| (iii) | $\ \ \ \ \ \ \ \ \ \ \ \ \text{CH}_3\\\ \ \ \ \ \ \ \ \ \ \ \ \ |\\\text{CH}_3-\text{C}^\ominus\\\ \ \ \ \ \ \ \ \ \ \ \ \ \ |\\\ \ \ \ \ \ \ \ \ \ \ \ \ \text{CH}_3$ | (c) | Stabilised by hyperconjugation. |
| (iv) | $\ \ \ \ \ \ \ \ \ \ \ \ \ _\oplus\\\text{CH}_3-\text{CH}-\text{CH}_3$ | (d) | A secondary carbocation. |
At 1127 K and 1 atm pressure, a gaseous mixture of CO and $CO _2$ in equilibrium with solid carbon has $90.55 \% CO$ by mass
$C ( s )+ CO _2(g) \rightleftharpoons 2 CO ( g )$
Calculate $K_c$ for this reaction at the above temperature.
→$C ( s )+ CO _2(g) \rightleftharpoons 2 CO ( g )$
Calculate $K_c$ for this reaction at the above temperature.
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→$\text{ }^{13}_{06}\text{C},\text{ }^{16}_{08}\text{O},\text{ }^{24}_{12}\text{Mg},\text{ }^{56}_{26}\text{Fe},\text{ }^{88}_{38}\text{Sr}$
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