Which of the following is a correctly written thermochemical equation?

NH4Cl --- NH4+ + Cl-

2C8H18 + 25O2 ---- 16CO2 +18H2O, H = -5,471 kJ/mol

4Fe (s) + 3O2 (g) ---- 2Fe2O3 (s), H = -3,926 kJ

C3H8 (g) + O2 (g) ----- CO2 (g) + H2O (l), H = -2,220 kJ/mol

Question

Which of the following is a correctly written thermochemical equation?

       NH4Cl  ---> NH4+ + Cl-

       2C8H18 + 25O2 ---->  16CO2 +18H2O, H = -5,471 kJ/mol

       4Fe (s) + 3O2 (g) ----> 2Fe2O3 (s), H = -3,926 kJ

       C3H8 (g) + O2 (g) -----> CO2 (g) + H2O (l), H = -2,220 kJ/mol

anonymous · Answer

I think it is C. Is that correct?