ICE tables Knowledge-Based Practice

Questions

1. 1.

   A sealed 1.0 L reaction vessel initially contains 0.80 M $\text{NO}_2(g)$ and 0.10 M $\text{N}_2\text{O}_4(g)$ at a constant temperature. When the system reaches equilibrium according to the equation $2\text{NO}_2(g) \rightleftharpoons \text{N}_2\text{O}_4(g)$, the concentration of $\text{NO}_2(g)$ is measured to be 0.20 M. What is the equilibrium concentration of $\text{N}_2\text{O}_4(g)$?

   • A) 0.30 M
   • B) 0.70 M
   • C) 0.40 M
   • D) 1.30 M
2. 2.

   A sealed reaction vessel contains an unknown initial concentration of $\text{PCl}_5(g)$ that decomposes at a constant temperature according to the equation $\text{PCl}_5(g) \rightleftharpoons \text{PCl}_3(g) + \text{Cl}_2(g)$. If the system reaches equilibrium with $K_c = 0.050$ and the equilibrium concentration of $\text{Cl}_2(g)$ is measured to be 0.20 M, what was the initial concentration of $\text{PCl}_5(g)$?

   • A) 0.80 M
   • B) 1.00 M
   • C) 0.60 M
   • D) 1.20 M
3. 3.

   A 1.00 L reaction vessel initially contains 1.00 mol of $\text{H}_2(g)$ and 1.00 mol of $\text{I}_2(g)$ at a constant temperature where $K_c = 64.0$ for the reaction $\text{H}_2(g) + \text{I}_2(g) \rightleftharpoons 2\text{HI}(g)$. Based on an ICE table analysis, what is the equilibrium concentration of $\text{HI}(g)$?

   • A) 0.20 M
   • B) 0.80 M
   • C) 1.60 M
   • D) 2.00 M
4. 4.

   A 2.0 L rigid container is initially charged with 1.20 mol of $\text{HI}(g)$ at a constant temperature. At equilibrium, the mixture contains 0.20 mol of $\text{I}_2(g)$ according to the reaction $2\text{HI}(g) \rightleftharpoons \text{H}_2(g) + \text{I}_2(g)$. What is the equilibrium concentration of $\text{HI}(g)$?

   • A) 0.50 M
   • B) 0.40 M
   • C) 0.80 M
   • D) 0.20 M
5. 5.

   A 1.00 L sealed reaction vessel initially contains 0.80 mol of $\text{CO}(g)$ and 0.80 mol of $\text{H}_2\text{O}(g)$ at a constant temperature. If the equilibrium concentration of $\text{CO}_2(g)$ is found to be 0.60 M for the reaction $\text{CO}(g) + \text{H}_2\text{O}(g) \rightleftharpoons \text{CO}_2(g) + \text{H}_2(g)$, what is the value of the equilibrium constant $K_c$?

   • A) 3.0
   • B) 9.0
   • C) 0.11
   • D) 4.5

Answers and step-by-step solutions appear after you finish the test.