Question

free energy
reaction progress
which line indicates a higher reaction rate?
a because it has a lower activation energy
b because it has a lower activation energy
a because its δg is much lower
b because its δg is much lower

Explanation:

Reaction rate is related to activation energy ($E_a$). Lower $E_a$ means more reactant molecules can overcome the energy barrier, so reaction is faster. From the graph, line B has lower activation energy than A. $\Delta G_{rxn}$ (free energy change) determines spontaneity, not reaction rate, so options about $\Delta G_{rxn}$ are incorrect. Thus, B (with lower $E_a$) has higher reaction rate.

Answer:

B because it has a lower activation energy