1.
(2017高二上·攀枝花期中)
已知下列热化学方程式:(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.则反应2C(s)+2H2(g)+O2(g)═CH3COOH(l)的△H为( )
A . ﹣488.3 kJ/mol
B . ﹣244.15 kJ/mol
C . +488.3 kJ/mol
D . +244.15 kJ/mol