In a 5.76 l vessel, 0.5 moles of H₂ gas and 0.5 moles of I₂ vapours are allowed to react to form HI(g) at 447°C, then total pressure of gases at equilibrium would be (R = 0.08 l-atm/K-mol)

Question

Prashant Kotian · Accepted Answer

Correct answer: B. For the reaction H₂ + I₂ ⇌ 2HI, the number of gaseous moles does not change (Δn = 0). The total moles at equilibrium equals the initial total moles = 0.5 + 0.5 = 1.0 mole. Total pressure P = nRT/V = (1.0 × 0.08 × 720) / 5.76 = 57.6 / 5.76 = 10 atm. Therefore, correct answer is B.

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