A-LevelChemistryEquilibria9701/12 · May/June 2022 · Q141 Mark
Hydrogen and iodine can react reversibly to produce hydrogen iodide. The equation is shown. H₂(g) + I₂(g) ⇌ 2HI(g) 4.00 mol of hydrogen gas and X mol of iodine vapour are mixed in a sealed container of volume 1.00 dm³ at a temperature of 460 K. The system is allowed to reach equilibrium. The equilibrium mixture contains 2.00 mol of hydrogen iodide. The equilibrium constant, K_c, for the reaction at 460 K is 4.0. What is the value of X?
A0.50 mol
B1.17 mol
C1.33 mol
D2.50 mol
✓ Correct answer
C: 1.33 mol
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