Which of the following is storing gravitational potential energy? a. a cat stalking a mouse b. a baseball player sliding into home plate c. a ballet dancer spinning on her toes d. a water bucket hanging over a well

The answer is D. A water bucket hanging over a well .

Spontaneity tell us the direction of the reaction, but not how fast it goes. gibbs free energy brings together enthalpy, entropy and temperature in one easy formula. g = h - ts. and, finally the sign of delta g is always negative for a spontaneous reaction.

The answer is c. 320 g