How many molecules are in 0.4mol h2

I might be wrong bcuz idk what 0.4 mol means but i think that it has 2 because it has two hydrogen 

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.