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 |