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In reaction N(2)(g)+3H(2)(g) hArr 2NH(3)...

In reaction `N_(2)(g)+3H_(2)(g) hArr 2NH_(3)(g), DeltaH=-93.6kJ`/mole, the yield of ammonia does not increase when

A

Pressure is increased

B

Temperature is lowered

C

Pressure is lowered

D

Volume of the reaction vessel is decreased

Text Solution

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The correct Answer is:
To solve the question regarding the yield of ammonia in the reaction \( N_2(g) + 3H_2(g) \rightleftharpoons 2NH_3(g) \) with \( \Delta H = -93.6 \, \text{kJ/mol} \), we need to analyze the effects of different changes on the equilibrium position according to Le Chatelier's principle. ### Step-by-Step Solution: 1. **Identify the Reaction Type**: The reaction is exothermic since \( \Delta H \) is negative. This means heat is released when ammonia is formed. 2. **Analyze the Moles of Gas**: - On the reactant side, there are \( 1 + 3 = 4 \) moles of gas (1 mole of \( N_2 \) and 3 moles of \( H_2 \)). - On the product side, there are \( 2 \) moles of gas (2 moles of \( NH_3 \)). 3. **Effect of Increasing Pressure**: - Increasing pressure shifts the equilibrium towards the side with fewer moles of gas. Here, that would be the product side (2 moles of \( NH_3 \)). - Thus, the yield of ammonia would increase. 4. **Effect of Decreasing Temperature**: - For exothermic reactions, decreasing the temperature shifts the equilibrium to the right (towards products) to produce more heat. - Therefore, the yield of ammonia would increase. 5. **Effect of Decreasing Pressure**: - Decreasing pressure shifts the equilibrium towards the side with more moles of gas. Here, that would be the reactant side (4 moles). - This means that the yield of ammonia will not increase; in fact, it may decrease. 6. **Effect of Decreasing Volume**: - Decreasing the volume increases the pressure. As established, increasing pressure shifts the equilibrium towards the side with fewer moles (the product side). - Thus, the yield of ammonia would increase. ### Conclusion: The yield of ammonia does not increase when **lowering the pressure**. ### Final Answer: The yield of ammonia does not increase when **lowering the pressure**. ---
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