Ammonia is made by the Haber process. The reactants are nitrogen and hydrogen. ?

Irene

2020-07-24 1:36 pm

Ammonia is made by the Haber process. The reactants are nitrogen and hydrogen.
N2(g) + 3H2(g) 2NH3(g) ∆H –ve
What will increase the rate of the forward reaction?
A adding argon to the mixture but keeping the total volume constant
B decreasing the temperature
C increasing the total pressure by reducing the total volume at constant temperature
D removing ammonia as it is made but keeping the total volume of the mixture the same

Why is the answer C instead of B?

Thank you.

回答 (1)

micatkie

2020-07-24 2:37 pm

✔ 最佳答案

A. false
Addition of argon does not affect the concentrations of nitrogen and hydrogen. Hence, there is no effect on the rate of the forward reaction.

B. false
Decreasing temperature lowers the rates of both the forward and backward reactions. This is because less molecules have the energies exceeding the activation energy.

C. true
Increasing the total pressure increases the rates of both the forward and backward reactions. Increasing the pressure makes the gas molecules become more concentrated and thus increases the frequency of collisions between gaseous particles.

D. false
Removing ammonia would not immediately affect the concentrations of nitrogen and hydrogen. The rate of the forward reaction keeps unchanged before the shift in equilibrium.

The answer: C. increasing the total pressure by reducing the total volume at constant temperature

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