已知下列反应的热化学方程式为: (1)C(s)+O2(g)=CO2(g) △H1= -393.5kj/mol (2)CH3COOH(1) +2O2 (g) =2CO2(g)+2H2O(l) △H2=-870.3kj/mol (3)H2(g)+1/2O2(g)=H2O(1) △H3= -285.8kj/mol 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.-244.15 kJ/mol D.244.15 kJ/mol |