For the reaction N2(g) + 3H2(g) ⇌ 2NH3(g), what is the expression for Kp? (2020)

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Question: For the reaction N2(g) + 3H2(g) ⇌ 2NH3(g), what is the expression for Kp? (2020)

Options:

Correct Answer: (P_NH3)^2 / (P_N2)(P_H2)^3

Exam Year: 2020

Solution:

Kp is expressed in terms of partial pressures, so for the reaction, Kp = (P_NH3)^2 / (P_N2)(P_H2)^3.

For the reaction N2(g) + 3H2(g) ⇌ 2NH3(g), what is the expression for Kp? (2020)

For the reaction N2(g) + 3H2(g) ⇌ 2NH3(g), what is the expression for Kp? (2020)

Step 1: Identify the reaction given: N2(g) + 3H2(g) ⇌ 2NH3(g).
Step 2: Understand that Kp is the equilibrium constant expressed in terms of partial pressures.
Step 3: Write down the products and reactants of the reaction.
Step 4: For the products (NH3), since there are 2 moles, we will square its partial pressure: (P_NH3)^2.
Step 5: For the reactants (N2 and H2), write their partial pressures. N2 has 1 mole, so it is (P_N2) and H2 has 3 moles, so we will cube its partial pressure: (P_H2)^3.
Step 6: Combine these into the Kp expression: Kp = (P_NH3)^2 / ((P_N2)(P_H2)^3).

Equilibrium Constant Expression – Understanding how to derive the expression for Kp based on the balanced chemical equation and the relationship between partial pressures of reactants and products.
Partial Pressures – Knowledge of how to express concentrations in terms of partial pressures for gaseous reactions.