Topical Questions These questions are keyed to the major topics in the chapter. Usually...

Topical Questions

These questions are keyed to the major topics in the chapter. Usually a question that is answered at the back of this book is paired with a similar one that is not.

The hydrocarbon C₄H₁₀ can exist in two gaseous forms: butane and 2-methylpropane. The value of K_c for conversion of butane to 2-methylpropane is 2.5 at 25 °C.

(a) Suppose that the initial concentrations of butane and 2-methylpropane are each 0.100 mol/L. Make up a table of initial concentrations, change in concentrations, and equilibrium concentrations for this reaction.

(b) Write the equilibrium constant expression in terms of x, the change in the concentration of butane, and then solve for x.

(c) If you place 0.017 mol butane in a 0.50-L sealed flask at 25 °C, what will be the equilibrium concentrations of the two isomers?