已知下列反应的热化学方程式为 :
(1)C(s)+O2(g)===CO2(g) ΔH1=-393.5 kJ/mol
(2)CH3COOH(l)+2O2(g)→2CO2(g)+2H2O(l) ΔH2=-870.3 kJ/mol
(3)H2(g)+1/2O2(g)===H2O(l) ΔH3=-285.8 kJ/mol
则2C(s)+2H2(g)+O2(g)===CH3COOH(l)的反应热(焓变)为 [ ]
A.488.3 kJ/mol
B.-488.3 kJ/mol
C.-244.15kJ/mol
D.244.15kJ/mol