問(wèn)答題

試判斷下列反應(yīng)的ΔrSθm是大于零還是小于零:
(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)


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