Question

$\Delta G$ for a spontaneous reaction is

• A. zero
• B. negative
• C. positive
• D. could be positive or negative

Answer 1

Answer: (B)

negative

Answer 2

For a spontaneous reaction, the sign on $\Delta G$ must be negative.
Gibbs free energy relates enthalpy, entropy and temperature.
A spontaneous reaction will always occur when $\Delta H$ is negative and $\Delta S$ is positive.