單項(xiàng)選擇題
A.Ag+(aq)+Br-(aq)AgBr(s) B. 2Ag (s) + Br2 (g) 2AgBr (s) C. Ag (s) +Br2 (l)AgBr (s) D. Ag (aq) +Br2 (g)AgBr (s)
A.2Ag(s)+Cl2(g)═2AgCl(s) B.Ag(g)+1/2Cl2(g)═AgCl(s) C.Ag(s)+1/2Cl2(g)═AgCl(s) D.Ag+(aq)+Cl-(aq)═AgCl(s)
A.2H2(g)+O2(g)=2H2O(l) B.NO(g)+(1/2)O2(g)=NO2(g) C.C(金剛石)=C(石墨) D.H2(g)+(1/2)O2(g)=H2O(l)
A.等于零 B.大于零 C.小于零 D.以上三種情況均可能
A.所有物質(zhì)的ΔcHmθ值小于零或等于零 B.CO2(g)的ΔcHmθ等于零() C.石墨的ΔcHmθ值就是CO2(g)的ΔfHmθ值 D.H2(g)的ΔcHmθ的值就是H2O(l)的ΔfHmθ值