Question

Gas A decomposed according to the following reaction:
A(g) $\rightarrow$ B(g) + C(g)
A student conducted an experiment and determined that the equilibrium pressure of gas A was 0.20 P, where P was the total pressure of the system. What is the equilibrium constant $K_p$ for this reaction?

• A. 0.10 P
• B. 0.20 P
• C. 0.40 P
• D. 0.80 P

Hint:

For gas-phase reactions, the equilibrium constant $K_p$ can be determined from the partial pressures of the gases.

Answer 1

The Correct Option is D

The equilibrium constant $K_p$ is calculated by using the equilibrium concentrations of the reactants and products. Since the total pressure is $P$ and the partial pressures are proportional to the amounts of gas, the equilibrium constant is calculated to be 0.80 P.