Question

Which of the following conditions will apply conversion of ice into water?
$\Delta H$ $\Delta S$ $\Delta G$

• A. negative negative negative at low T
• B. negative negative positive at low T
• C. positive positive positive at low T
• D. positive positive negative at low T

Answer 1

Answer: (C)

positive positive positive at low T

$\Delta G=\Delta H-T\Delta S$

Melting of ice is an endothermic process as ice absorbs heat from the surroundings to convert into the water. So, $\Delta H=$positive. The randomness of the system increases as solid (ice) changes into liquid (water), therefore, $\Delta S=$ positive. At low temperature, $\Delta H-T\Delta S$ is positive. So, $\Delta G=$ positive at low T.