已知2H2（g）+O2（g）═2H2O（l）；△H=-569.6kJ•mol-1，2H2O（g）═2H2（g）+O2（g）；△H=+482.1kJ•mol-1．现有1g液态H2O，蒸发时吸收的热量是（

问题描述：

已知2H₂（g）+O₂（g）═2H₂O（l）；△H=-569.6kJ•mol^-1，2H₂O（g）═2H₂（g）+O₂（g）；△H=+482.1kJ•mol^-1．现有1g液态H₂O，蒸发时吸收的热量是（　　）

A．2.43kJ
B．4.86kJ
C．43.8kJ
D．87.5kJ

最佳答案：

已知：①2H2（g）+O2（g）═2H2O（l）；△H=-569.6kJ•mol-1，②2H2O（g）═2H2（g）+O2（g）；△H=+482.1kJ•mol-1．根据盖斯定律，②+①得2H2O（g）═2H2O（l）；△H=-87.5kJ•mol-1，所以2H2O（l）═2H2O（g）；...

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