A reaction vessel is charged with 3.60 moles of hydrogen gas and 2.00 moles of iodine vapour, then sealed and kept at a fixed temperature. The reaction is represented by the equation: $\text{H}_2 + \text{I}_2 \rightleftharpoons 2\text{HI}$. When equilibrium is reached, 3.20 moles of hydrogen are still present. Every reactant and product is in the gaseous state. What is the value of $K_p$ for these conditions?
- A$0.0313$
- B$0.125$
- C$0.156$
- D$8.00$