Question

which of the following statements about a system at chemical equilibrium is true?
the system consumes energy at a steady rate.
the system releases energy at a steady rate.
over time, the system will spontaneously move away from equilibrium.
the system can do no work.

Explanation:

At chemical equilibrium, the forward and reverse reaction rates are equal, and there is no net change in the concentrations of reactants and products. Since there is no net change, the system is in a state where it can no longer perform work (as work requires a change or a driving force). Energy consumption or release at a steady rate would imply a continuous change (not equilibrium). Also, a system at equilibrium is stable and does not spontaneously move away from equilibrium on its own (without external interference).

Answer:

The system can do no work.