25℃、101 kPa时，强酸与强碱的稀溶液发生中和反应的中和热为57.3 kJ·mol^－1，辛烷的燃烧热为5518 kJ·mol^－1。下列热化学方程式书写正确的是

A．2H^＋(aq)＋SO4^2^— (aq)＋Ba^2^＋(aq)＋2OH^－(aq)===BaSO4(s)＋2H2O(l)　ΔH＝－57.3 kJ·mol^－^1

B．KOH(aq)＋1/2H2SO4(aq)==="1/2" K2SO4(aq)＋H2O(l)　ΔH＝－57.3 kJ·mol^－^1

C．C8H18(l)＋25/2O2(g)===8CO2(g)＋9H2O(g)ΔH＝－5518 kJ·mol^－^1

D．2C8H18(g)＋25O2(g)===16CO2(g)＋18H2O(l)ΔH＝－5518 kJ·mol^－^1