Question

For a process to be spontaneous at constant $T$ and $P$:

• A. $(\Delta G{)}_{system}$ must be negative
• B. $(\Delta G{)}_{system}$ must be positive
• C. $(\Delta S{)}_{system}$ must be positive
• D. $(\Delta S{)}_{system}$ must be negative

Answer 1

Answer: (A)

$(\Delta G{)}_{system}$ must be negative

The standard free energy change by using the standard entropies and enthalpies of a reaction.

When $\Delta G=-ve$, the change in the enthalpy and entropy will be positive and which is depends on the temperature and spontaneity ocuurs due to high temperature.