题目

已知下列热化学方程式： （1）CH3COOH (l)+2O2 (g) == 2CO2 (g)＋2H2O (l)  ΔH1＝－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＝-285.8kJ·mol-1 则反应2C (s)+2H2 (g) +O2  (g) == CH3COOH (l)的△H为（    ） A． -488.3 kJ·mol-1   B．-244.15 kJ·mol-1    C．+488.3 kJ·mol-1  D．+244.15 kJ·mol-1According to the survey c last week, more than half college students admitted having consumed alcoholic drinks.