S(s)+O2(g)=SO2(g) ∆H1
S(g)+O2(g)=SO2(g) ∆H2
OH- (aq)+ H+ (aq) = H2O (l) ∆H3
OH- (aq)+CH3COOH(aq) = CH3COO- (aq)+H2 O (l) ∆H4