Chemistry - Chemical Equilibrium Question with Solution | TestHub
ChemistryChemical EquilibriumProblems involving KpEasy2 minQB
ChemistryEasysingle choice
For the reaction: 2NO(g) + Br2(g) ⇌ 2NOBr(g), NO and Br2 are initially taken in mole ratio of 2:1. The total pressure at equilibrium is found to be 2 atm. If the moles of NOBr are one-third of that of Br2 at equilibrium, Kp for the reaction is
Options:
Answer:
B
Solution:
Take 2 mol NO and 1 mol Br2; let x mol of Br2 react At equilibrium: NO = 2 - 2x, Br2 = 1 - x, NOBr = 2x
2x = (1 - x)/3 gives x = 1/7
Moles: NO = 12/7, Br2 = 6/7, NOBr = 2/7; total = 20/7 mol
Partial pressures at 2 atm: PNO = 1.2, PBr2 = 0.6, PNOBr = 0.2 atm
Kp = (0.2)2/[(1.2)2 × 0.6] = 0.04/0.864 = 5/108 atm-1
This is option (b).
Stream:JEESubject:ChemistryTopic:Chemical EquilibriumSubtopic:Problems involving Kp
⏱ 2mℹ️ Source: QB
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