Question

【题目】已知C2H4(g)和C2H5OH(l)的燃烧热分别是 1 411.0 kJ/mol和 1 366.8 kJ/mol，则由C2H4(g)与H2O(l)反应生成C2H5OH(l)的ΔH为

A．44.2 kJ/mol B．+44.2 kJ/mol

C．330 kJ/mol D．+330 kJ/mol

Answer 1

【答案】A

【解析】由题意可得：

①C2H4(g) + 3O2(g)2CO2(g) + 2H2O(l) △H1 = 1411.0 kJ/mol

②C2H5OH(l) + 3O2(g)2CO2(g) + 3H2O(l) △H2 = 1366.8 kJ/mol

①②得：C2H4(g) + H2O(l)C2H5OH(l) △H = 44.2 kJ/mol。