Which is a diatomic molecule?
a)he
b)o2
c)nacl
d)cuf2

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.

12 is probably the typical age for a first kiss but i think its to young.