Chemistry - Chemical Equilibrium Question with Solution | TestHub
ChemistryChemical EquilibriumProblems involving KcEasy2 minQB
ChemistryEasysingle choice
Starting with 3 moles SO2 and 2 moles of O2 in a 2 L flask, the equilibrium mixture required 0.6 moles of MnO4- for complete reaction in acidic medium. Kc for 2SO2(g) + O2(g) ⇌ 2SO3(g) is
Options:
Answer:
A
Solution:
Only SO2 reacts with MnO4-, in the mole ratio MnO4- : SO2 = 2:5 SO2 left = 0.6×5/2 = 1.5 mol
SO2 reacted = 3 - 1.5 = 1.5 mol, so SO3 = 1.5 mol and O2 = 2 - 0.75 = 1.25 mol
Concentrations in 2 L: SO2 = 0.75 M, SO3 = 0.75 M, O2 = 0.625 M
Kc = ((0.75)2)/((0.75)2(0.625)) = 1.6 L mol-1
This is option (a).
Stream:JEESubject:ChemistryTopic:Chemical EquilibriumSubtopic:Problems involving Kc
⏱ 2mℹ️ Source: QB
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