The industrial production of ammonia is represented by the Haber process reaction shown. $$N_2(g) + 3H_2(g) \rightleftharpoons 2NH_3(g) \quad \Delta H = -91.8 \: kJ \: mol^{-1}$$ Factors such as temperature and pressure need to be considered in order to maximise yield. Which of the following is correct?: A. A lower pressure would result in a higher yield. B. A higher pressure would result in a higher yield. C. A lower temperature would result in a lower yield. D. A higher temperature would result in a higher yield.

SSCE HSC Chemistry Alcohols: The industrial production of amm

The industrial production of ammonia is represented by the Haber process reaction shown - HSC - SSCE Chemistry - Question 12 - 2023 - Paper 1

Question 12

The industrial production of ammonia is represented by the Haber process reaction shown. $$N_2(g) + 3H_2(g) \rightleftharpoons 2NH_3(g) \quad \Delta H = -91.8 \: kJ... show full transcript

Worked Solution & Example Answer:The industrial production of ammonia is represented by the Haber process reaction shown - HSC - SSCE Chemistry - Question 12 - 2023 - Paper 1

Step 1

A. A lower pressure would result in a higher yield.

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Answer

This statement is incorrect. Lowering the pressure would favor the reaction that produces more moles of gas. In the Haber process, 4 moles of reactants produce 2 moles of product, so higher pressure favors the formation of ammonia.

Step 2

B. A higher pressure would result in a higher yield.

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This statement is correct. Increasing the pressure shifts the equilibrium towards the side with fewer gas moles, thus favoring the formation of ammonia and maximizing yield.

Step 3

C. A lower temperature would result in a lower yield.

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This statement is generally incorrect. While lower temperatures favor the formation of products in exothermic reactions, they also slow the reaction rate, which can lead to practical challenges in industrial settings.

Step 4

D. A higher temperature would result in a higher yield.

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Answer

This statement is incorrect. Higher temperatures shift the equilibrium position back towards the reactants for exothermic reactions, reducing ammonia yield.

The industrial production of ammonia is represented by the Haber process reaction shown - HSC - SSCE Chemistry - Question 12 - 2023 - Paper 1

Worked Solution & Example Answer:The industrial production of ammonia is represented by the Haber process reaction shown - HSC - SSCE Chemistry - Question 12 - 2023 - Paper 1

A. A lower pressure would result in a higher yield.

B. A higher pressure would result in a higher yield.

C. A lower temperature would result in a lower yield.

D. A higher temperature would result in a higher yield.

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