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Question

Kp=0.04atm at 899 K for the equilibrium shown below. What is the equilibrium concentration of C2H6 when it is placed in a flask at 4.0 atm pressure and allowed to come to equilibrium?
C2H6(g)C2H4(g)+H2(g)

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Solution

The initial partial pressures of ethane, ethylene and hydrogen are 4.0 atm, 0 atm and 0 atm respectively.
The equilibrium parial pressures are 4-p atm, p atm and p atm respectively.
The equilibrium constant expression is
Kc=PC2H4PH2PC2H6=p×p4p=0.04
p2=0.160.04p
p=0.38
The equilibrium concentration of ethane is 40.38=3.62 atm.

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