Question
Higher yield of NO in $N_{2}(\text{ }g) + O_{2}(\text{ }g) \rightleftharpoons 2NO(g)$ can be obtained at
[ $\Delta H$ of the reaction $= + 180.7\text{ }kJ{\text{ }mol}^{- 1}$ ]
A. Higher temperature
B. Lower temperature
C. Higher concentration of $N_{2}$
D. Higher concentration of $O_{2}$
Choose the correct answer from the options given below:
Options
Solution
Sol. [Key Concept: Conditions for a higher yield of NO (Le Chatelier; endothermic reaction)] Yield of the product generally depends on
Temperature
Concentration of reactant(s) and product(s)
Pressure
As this is an endothermic reaction ( $\Delta H = + 180.7\text{ }kJ{\text{ }mol}^{- 1}$ ), so, increase in temperature will shift equilibrium in forward direction to increase yield of NO.
Increase in concentration of reactants ( $N_{2}$ and $O_{2}$ ) also shifts the equilibrium in forward direction and increase the yield of NO.
Hence, A, C and D only will increase yield of NO.
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