题目

已知：2Zn(s)+O2(g)=2ZnO(s)    △H=-701.0kJ·mol-1       2Hg(1)+O2(g)=2HgO(s)      △H=-181.6kJ·mol-1则反应Zn(s)+HgO(s)=ZnO(s)+Hg(1)的△H为（    ）A．+519.4kJ·mol-1                                                                                            B．-519.4 kJ·mol-1C．+259.7kJ·mol-1                                                                                            D．-259.7 kJ·mol-1  答案：D解析:略 

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