Hydrogen combines with iodine to produce hydrogen iodide. The reaction occurs slowly. $\text{H}_2(g) + \text{I}_2(g) \rightleftharpoons 2\text{HI}(g)$ 1 mole of hydrogen gas and 1 mole of iodine vapour were brought together and left to react. After $t$ seconds, $0.6$ moles of hydrogen were still present. What is the number of moles of iodine left after $t$ seconds?
- A0.0
- B0.4
- C0.6
- D1.0