Melissa found that when she
added 965 j of energy to a 0.25-kg sample
of copper, the temperature of the copper
increased by 10 k. what is the specific heat of
copper? show your work.

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.