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Question

1 mole of H2O and CO are taken in a 10 liter container at equilibrium point 40% of H2O reacts with CO to form H2O & CO2 Calculate the equilibrium constant for the reaction.

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Solution

[H2O] = [CO] = 1 mol/10 L = 0.1M
40 % of 1mole = 1 mole x 40/100 = 0.40 mole
molarity = moles /volume = 0.40 mol /10 L = 0.040 M
H2O CO H2 CO2
Initial 0.1 0.1 0 0
Change 0.04 0.04 0.04 0.04
equilibrium 0.06 0.06 0.04 0.04

Kc = [H2][CO2]/[[H2O][CO]
= 0.04 x 0.04 / 0.06 x 0.06
=0.0016/0.0036
= 0.44

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