已知下列反应的反应热为:
(1)CH3COOH(l)+2O2(g)=2CO2(g)+2H2O(l) △H1=-870.3KJ/mol
(2)C(s)+O2(g)=CO2(g) △H2=-393.5KJ/mol (3) H2(g)+O2(g)=H2O(l) △H3="-285.8KJ/mol "
试计算下列反应的焓变:2C(s)+2H2(g)+O2(g)=CH3COOH(l) △H=( )
A.-488.3 KJ/mol |
B.+488.3KJ/mol |
C.-245.7KJ/mol |
D.+245.7KJ/mol |