.已知下列热化学方程式:
(1)CH3COOH(l)+2O2(g) ="==" 2CO2(g)+2H2O(l) △H1= -870.3 kJ·mol-1
(2)C(s)+O2(g) ="==" CO2(g) △H2= -393.5 kJ·mol-1
(3)H2(g)+O2(g) === H2O(l) △H3= -285.8 kJ·mol-1
则反应2C(s)+2H2(g)+O2(g)="==CH3COOH(l)" 的焓变△H为( )kJ·mol-1
A.488.3 |
B.-244.15 |
C.244.15 |
D.-488.3 |