Chemistry - Chemical Equilibrium Question with Solution | TestHub
ChemistryChemical EquilibriumProblems involving KcMedium2 minQB
ChemistryMediumsingle choice
At the same temperature, a fresh mixture contains only methanol and propanoic acid, with initial methanol mole fraction 5/14. What fraction of the methanol is esterified at equilibrium?
Options:
Answer:
B
Solution:
The initial methanol:acid ratio is 5:9; take initial amounts 1 mol methanol and 1.8 mol acid. For a fraction α of methanol esterified, 9=α2/[(1-α)(1.8-α)].
Testing α=0.90 gives (0.90)2/[(0.10)(0.90)]=9, satisfying the equilibrium condition.
The other quadratic root is 2.25, which exceeds the available methanol amount and is rejected.
The fraction esterified is 0.90, giving option (b).
Stream:JEESubject:ChemistryTopic:Chemical EquilibriumSubtopic:Problems involving Kc
⏱ 2mℹ️ Source: QB
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