A reaction can form either product A or product B

CHEMISTRY · Subjective · AP · Chemistry · Thermodynamics and Electrochemistry · Thermodynamics and Electrochemistry

Problem

A reaction can form either product A or product B. Activation energies:

E_{a,\,A}=40\,\text{kJ mol}^{-1}

and

E_{a,\,B}=80\,\text{kJ mol}^{-1}

. Standard Gibbs energies of formation:

\Delta G^{\circ}_{\,A}=-60\,\text{kJ mol}^{-1}

and

\Delta G^{\circ}_{\,B}=-100\,\text{kJ mol}^{-1}

. At which product is expected to predominate at (i)

25\,^{\circ}\text{C}

and (ii)

150\,^{\circ}\text{C}