已知:Zn(s)+(1/2)O2 = ZnO ΔcHm=351.5 kJ·mol-1 Hg(l)+(1/2)O2 = HgO ΔcHm= 90.8 kJ·mol-1 因此
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已知:Zn(s)+(1/2)O2 = ZnO ΔcHm=351.5 kJ·mol-1 Hg(l)+(1/2)O2 = HgO ΔcHm= 90.8 kJ·mol-1 因此 Zn+HgO = ZnO+Hg 的ΔrHm是:
A.442.2 kJ·mol-1
B.260.7 kJ·mol-1
C.-62.3 kJ·mol-1
D.-442.2 kJ·mol-1

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已知:(1)Zn(s)+ 1 2 O 2 (g)═ZnO(s),△H=-348.3kJ/mol, (2)2Ag(s)+ 1 2 O 2 (g)═Ag 2 O(s),△H=-31.0kJ/mol, 根据盖斯定律,(1)-(2)得Zn(s)+Ag 2 O(s)═ZnO(s)+2Ag(s),△H=-317.3kJ/mol. 故选:C.
