Cyclohexane, C6H12, a hydrocarbon, can isomerize or change into methylcyclopentane, a compound of the same formula (C5H9CH3) but with a different molecular structure.

Question

The equilibrium constant is 0.12 at 25°C. If you had originally placed 0.036 mol of cyclohexane in a 1.0 L flask, what would be the concentrations of cyclohexane and methylcyclopentane when equilibrium is established?

For [C6H12]?

For [C5H9CH3]?

Answer 1

Is this Kc or Kp = 0.12? I will assume it is Kc.
What is the reaction for K. I will assume it is
cyclohexane ==> methyl cyclopentane

K = 0.12 = (mcyp)/(cyh)

Set up an ICE chart.
...........mcyh ==> mcyp
initial....0.036....0
change.....-x.......x
equil.....0.036-x...x

Substitute the equilibrium values into the Kc expression and solve for x.

Answer 2

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