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Questions

1. 1.

   A sealed 1.00 L flask at a constant temperature initially contains an unknown concentration of $\text{PCl}_5(g)$ and no products. At equilibrium, the concentration of $\text{Cl}_2(g)$ is measured to be 0.15 M according to the reaction $\text{PCl}_5(g) \rightleftharpoons \text{PCl}_3(g) + \text{Cl}_2(g)$. If the equilibrium constant $K_c$ is 0.045, what was the initial concentration of $\text{PCl}_5(g)$?

   • A) 0.65 M
   • B) 0.50 M
   • C) 0.35 M
   • D) 0.80 M
2. 2.

   A 1.00 L sealed reaction vessel is initially charged with 2.00 mol of $\text{N}_2(g)$ and 4.00 mol of $\text{H}_2(g)$ at a constant temperature. If the equilibrium concentration of $\text{NH}_3(g)$ is 0.80 M according to the equation $\text{N}_2(g) + 3\text{H}_2(g) \rightleftharpoons 2\text{NH}_3(g)$, what is the equilibrium concentration of $\text{H}_2(g)$?

   • A) 3.60 M
   • B) 3.20 M
   • C) 1.60 M
   • D) 2.80 M
3. 3.

   A 1.00 L reaction vessel initially contains 1.50 mol of $\text{NO}_2(g)$ at a constant temperature. The system establishes equilibrium according to the equation $2\text{NO}_2(g) \rightleftharpoons 2\text{NO}(g) + \text{O}_2(g)$. If the equilibrium concentration of $\text{O}_2(g)$ is 0.35 M, what is the equilibrium concentration of $\text{NO}_2(g)$?

   • A) 1.15 M
   • B) 0.80 M
   • C) 0.70 M
   • D) 0.45 M
4. 4.

   A 2.00 L reaction vessel initially contains 1.60 mol of $\text{HI}(g)$ at a constant temperature. If the system establishes equilibrium according to the equation $2\text{HI}(g) \rightleftharpoons \text{H}_2(g) + \text{I}_2(g)$ with $K_c = 0.25$, what is the equilibrium concentration of $\text{I}_2(g)$?

   • A) 0.40 M
   • B) 0.27 M
   • C) 0.20 M
   • D) 0.10 M
5. 5.

   A 1.00 L sealed container is charged with 0.80 mol of $\text{CO}(g)$ and 0.80 mol of $\text{H}_2\text{O}(g)$ at a constant temperature. If 0.60 mol of $\text{CO}_2(g)$ is present at equilibrium according to $\text{CO}(g) + \text{H}_2\text{O}(g) \rightleftharpoons \text{CO}_2(g) + \text{H}_2(g)$, what is the value of the equilibrium constant $K_c$?

   • A) 3.0
   • B) 9.0
   • C) 0.11
   • D) 1.5