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问答题

计算题

试判断下列反应的ΔrSθm是大于零还是小于零:
(1)Zn(s)+2HCl(aq)→ZnCl(aq)+H2(g)
(2)CaCO3(s)→CaO(s)+CO2(g)
(3)NH3(g)+HCl(g)→NH4Cl(s)
(4)CuO(s)+H2(g)→Cu(s)+H2O(l)

【参考答案】

(1)ΔrSθm=-285.1J·mol-1·K-1>0
(2)ΔrSθm=160.2J·mol-1·K-1>0
(3)ΔrSθm=-285.1J·mol-1·K-1<0
(4)ΔrSθm=-70.1J·mol-1·K-1<0