The value of KC for the interconversion of butane and isobutane is 2.5 at 25°C. If you place 0.067 mol of butane in a 0.250-L flask at 25°C and allow equilibrium to be established, what will be the concentrations of the two forms of butane?

Question

The value of KC for the interconversion of butane and isobutane is 2.5 at 25°C. If you place 0.067 mol of butane in a 0.250-L flask at 25°C and allow equilibrium to be established, what will be the concentrations of the two forms of butane?
A)[butane]
B)[isobutane]

DrBob222 · Accepted Answer

initial concn = 0.067/0.250 = approx 0.27 but that's just an estimate.

...........A ==> B
I.......0.027...0
C.........-x....x
E......0.027-x..x

Substitute the E line into Kc expression and solve for x.