單項(xiàng)選擇題

由下列數(shù)據(jù)確定CH4(g)的為()
C(石墨)+O2(g)=CO2(g)=-393.5kJ·mol-1
H2(g)+O2(g)=H2O(l)=-285.8kJ·mol-1
CH4(g)+2O2(g)=CO2(g)+2H2O(l)=-890.3kJ·mol-1

A.211kJ·mol-1;
B.-74.8kJ·mol-1;
C.890.3kJ·mol-1;
D.缺條件,無法算。


您可能感興趣的試卷

你可能感興趣的試題

1.單項(xiàng)選擇題下列各反應(yīng)的(298)值中,恰為化合物標(biāo)準(zhǔn)摩爾生成焓的是()

A.2H(g)+O2(g)→H2O(l)
B.2H2(g)+O2(g)→2H2O(l)
C.N2(g)+3H2(g)→2NH3(g)
D.N2(g)+H2(g)→NH3(g)

2.單項(xiàng)選擇題在下列反應(yīng)中,Qp=Qv的反應(yīng)為()

A.CaCO3(s)→CaO(s)+CO2(g)
B.N2(g)+3H2(g)→2NH3(g)
C.C(s)+O2(g)→CO2(g)
D.2H2(g)+O2(g)→2H2O(l)