For the exothermic equilibrium $N X_{2} (g) + 3 H X_{2} (g) 2 NH X_{3} (g)$ , which single change increases both the rate at which equilibrium is attained and the equilibrium yield of ammonia?

Aincreasing the pressure at constant temperature
Blowering the temperature at constant pressure
Cadding a catalyst at constant temperature and pressure
Draising the temperature at constant pressure

Answer: A

Increasing the pressure raises concentrations (faster rate) and shifts the equilibrium toward fewer gas moles (4 mol to 2 mol), raising the yield. Lowering T raises the yield of an exothermic reaction but slows the rate; a catalyst changes only the rate; raising T speeds the reaction but lowers the yield.

Practice p-Block Elements: Groups 15 and 16 More on Nitrogen compounds: ammonia, oxides of nitrogen, nitric acid

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For the exothermic equilibrium NX2​(g)+3HX2​(g)​2NHX3​(g), which single change increases both the rate at which equilibrium is attained and the equilibrium yield of ammonia?

Answer: A

More questions on Nitrogen compounds: ammonia, oxides of nitrogen, nitric acid

For the exothermic equilibrium $N X_{2} (g) + 3 H X_{2} (g) 2 NH X_{3} (g)$ , which single change increases both the rate at which equilibrium is attained and the equilibrium yield of ammonia?