Question

What is the free energy change ($\Delta$ G) when 1.0 mole of water at ${100}^{\circ }C$ and 1 atm pressure is converted into steam at ${1000}^{o}C$ and 1 atm pressure?

• A. 80 cal
• B. 540 cal
• C. 620 cal
• D. Zero

Answer 1

The correct option is D Zero

As the pressure and temperature are not changed. There is equilibrium. and thus $\Delta G=0$

Hence, the correct option is $D$