In which equation does the term "heat" represent heat of fusion?
(1) NaCl(s) + heat -->NaCl(l)
(2) NaOH(aq) + HCl(aq) -->NaCl(aq) + H2O(l) + heat
(3) H2O(l) + heat --> H2O(g)
(4) H2O(l) + HCl(g) -->H3O+(aq) + Cl-(aq) + heat
(1) NaCl(s) + heat -->NaCl(l)
(2) NaOH(aq) + HCl(aq) -->NaCl(aq) + H2O(l) + heat
(3) H2O(l) + heat --> H2O(g)
(4) H2O(l) + HCl(g) -->H3O+(aq) + Cl-(aq) + heat