Question
Equimolar concentrations of H2 and I2 are heated to equilibrium in a 2litre flask. At equilibrium, the forward and backward rate constants are found to be equal. What percentage of initial concentration of H2has reacted at equilibrium?
Answer: Option C
:
C
Solution:Correct option is c).
H2(g)+l2(g)⇋2HI(g)Initialmoles110Atequilibrium1−x1−x2xMolarconcentration(mol/L)(1−x)/2(1−x)/22x/2=x
K=x2/(1−x)×(1−x)2×2=4x2/(1−x)2≈4x2
K=Kf/Kb=1
4x2=1x=12,i.e.,50%
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:
C
Solution:Correct option is c).
H2(g)+l2(g)⇋2HI(g)Initialmoles110Atequilibrium1−x1−x2xMolarconcentration(mol/L)(1−x)/2(1−x)/22x/2=x
K=x2/(1−x)×(1−x)2×2=4x2/(1−x)2≈4x2
K=Kf/Kb=1
4x2=1x=12,i.e.,50%
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