How many bonding electrons are shown below?
H-C=C-H

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.

True, the standard unit for volume is liters which can be represented by either a lower case "l" or a capital "l"