Which chemical reaction below yields the heat of formation of liquid ammonia (NH3) ? 3/2H2(g)+1/2N2(g)NH3(1) H2(g)+N2(g)NH3(l) 3H2(g)+N2(g)2NH3(l) 3/2H2(g)+N(g)NH3(1) 3H(g)+N(g)NH3(l) Consider the following two reactions and the corresponding enthalpy changes CH4(g)+2O2(g)CO2(g)+2H2O(l),H12CH4(g)+O2(g)2CH3OH(1),H2 Express the enthalpy change for the third reaction 2CH3OH(I)+3O2(g)2CO2(g)+4H2O(g),H3 in terms of H1 and H2. H3=H1H2H3=2H1+H2H3=2H1H2H3=H1+H2H3=2H2H1