Consider the isomerization of butane with an equilibrium constant of K = 2.5. (See Study Question 13.) The system is originally at equilibrium with [butane] = 1.0 M and [isobutane] = 2.5 M.
(a) If 0.50 mol/L of isobutane is suddenly added and the system shifts to a new equilibrium position, what is the equilibrium concentration of each gas?
(b) If 0.50 mol/L of butane is added to the original equilibrium mixture and the system shifts to a new equilibrium position, what is the equilibrium concentration of each gas?

Data given in Question 13

The value of K_c for the interconversion of butane and isobutane is 2.5 at 25°C.

If you place 0.017 mol of butane in a 0.50-L flask at 25°C and allow equilibrium to be established, what will be the equilibrium concentrations of the two forms of butane?

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butane isobutane