摘要:15.已知下列热化学方程式: (1)CH3COOH(l)+2O2(g)===2CO2(g)+2H2O(l) ΔH1=-870.3 kJ/mol +O2(g)===CO2(g) ΔH2=-393.5 kJ/mol (3)H2(g)+O2(g)===H2O(l) ΔH3=-285.8 kJ/mol 则反应2C(s)+2H2(g)+O2(g)===CH3COOH A.-488.3 kJ/mol B.-244.15 kJ/mol C.488.3 kJ/mol D.244.15 kJ/mol 解析:根据盖斯定律.式即得2C(s)+2H2(g)+O2(g)===CH3COOH(l).则其焓变ΔH=+-=-488.3 kJ/mol.故选A. 答案:A

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