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
