40 % of HI undergoes decomposition to H 2 and I 2 at 300 K . ΔG Θ for this decompostion reaction at one atmopsphere pressure is____ Jmol - 1 -[nearest integer] Use R = 8 . 31 JK - 1 mol - 1 ; log 2 = 0 . 3010 , ln 10 = 2 . 3 , log 3 = 0 . 477

Step-by-step solution

HI g ⇌ 1 2 H 2 g + 1 2 I 2 g Initial moles 1 0 0 moles at equilibrium 1 - 0 . 4 0 . 2 0 . 2 K P = 0 . 2 1 2 × 0 . 2 1 2 0 . 6 K P = 0 . 2 0 . 6 = 1 3 ΔG ° = - 2 . 3 RTlogK P = - 2 . 3 × 8 . 31 × 300 log 1 3 = 2375 Jmol - 1