Suggest a reason why 500 °C is the temperature chosen to operate an industrial ammonia plant rather than 200 °C. Answer Sample Answers and Mark Allocation Speed up reaction, too slow at 200ºC Not acceptable: 1 Any mention of decomposition Cost Negates: Faster & produces more ammonia St Gr Potassium hydroxide reacts with sulphuric acid to form potassium sulphate, which can be used 1 2012 as a fertiliser. Q 15 Calculate the percentage, by mass, of potassium in potassium sulphate, K2SO4. (c) Show your working clearly.
Suggest a reason why 500 °C is the temperature chosen to operate an industrial ammonia plant rather than 200 °C. Answer Sample Answers and Mark Allocation Speed up reaction, too slow at 200ºC 1 Not acceptable: Any mention of decomposition Cost Negates: Faster & produces more ammonia St Gr 2012 Q 15 (c) Potassium hydroxide reacts with sulphuric acid to form potassium sulphate, which can be used as a fertiliser. Calculate the percentage, by mass, of potassium in potassium sulphate, K2SO4. Show your working clearly. 1
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