The free energy of formation of one mole of compound refers to a particular chemical equation. For each of the following, write that equation.
a) Water: 2H2(g)+O2(g)→2H2O(l)
b) Carbon dioxide: C(s)+O2(g)→CO2(g)
c) Methane: CH4(g)→C(s)+2H2(g)
d) Ammonia: N2(g)+3H2(g)→2NH3(g)