已知下列物质ΔfHmɵ/kJ·mol-1:C2H6(g,-84.7)、C2H4(g,52.3)、HF(g,-271.0),则反应:C2H6(g)+F2(g)=C2H4(g)+2HF(g)的ΔrHmɵ为()
A. 405kJ·mol-1
B. 134kJ·mol-1
C. -134kJ·mol-1
D. -405kJ·mol-1
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反应Na2O(s)+I2(g)=2NaI(s)+1/2O2(g)的ΔrHmɵ为( )
A. 2ΔfHmɵ(NaI,s)-ΔfHmɵ(Na2O,s)
B. ΔfHmɵ(NaI,s)-ΔfHmɵ(Na2O,s)-ΔfHmɵ(I2,g)
C. 2ΔfHmɵ(NaI,s)-ΔfHmɵ(Na2O,s)-ΔfHmɵ(I2,g)
D. ΔfHmɵ(NaI,s)-ΔfHmɵ(Na2O,s)
下列反应中,焓变等于AgBr(s)的ΔfHmɵ[AgBr(s)]的反应是( )
Ag+(aq)+Br-(aq)=AgBr(s)
B. 2Ag(s)+Br2(g)=2AgBr(s)
C. Ag(s)+1/2Br2(l)=AgBr(s)
D. Ag(s)+1/2Br2(g)=AgBr(s)
CuCl2(s)+Cu(s)=2CuCl(s)ΔrHmɵ=170kJ·mol-1Cu(s)+Cl2(g)=CuCl2(s)ΔrHmɵ=-206kJ·mol-1则CuCl(s)的ΔfHmɵ为( )kJ·mol-1。
A. 36
B. 18
C. -18
D. -36
已知C2H6(g)+7/2O2(g)=2CO2(g)+3H2O(l),C2H6(g)、CO2(g)、H2O(l)的ΔfHmɵ(kJ·mol-1)分别为:-85、-394、-286,试求上述反应的ΔrHmɵ为( )
A. ΔrHmɵ=(-85+394+286)kJ·mol-1
B. ΔrHmɵ=(-394+85-286)kJ·mol-1
C. ΔrHmɵ=[-85-2×(-394)-3×(-286)] kJ·mol-1
D. ΔrHmɵ=[2×(-394)+3×(-286)-(-85)]kJ·mol-1