A celestial body has these properties: -It is too small to clear objects that are in its orbital path.
-It has a rocky surface but no rings.
What could the celestial body be?

A) Pluto
B) Neptune
C) Jupiter
D) Mars
E) an artificial satellite

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.