题目
题型:不详难度:来源:
CO(g)+1/2O2(g)=CO2(g)△H=-282.5kJ/mol
假如标准状况下由CH4、CO、CO2组成的89.6L混和气体完全燃烧时能放出1010kJ的热量,并生成18g液态水,那么燃烧前混和气体中CO所占的体积百分含量为( )
A.40% | B.50% | C.12.5% | D.37.5% |
下列各组热化学方程式中,△H1>△H2的是( ) ①C(s)+1/2O2(g)=CO(g)△H1C(s)+O2(g)=CO2(g)△H2 ②S(s)+O2(g)=SO2(g)△H1S(g)+O2(g)=SO2(g)△H2 ③H2(g)+1/2O2(g)=H2O(l)△H12H2(g)+O2(g)=2H2O(l)△H2 ④CaCO3(s)═CaO(s)+CO2(g)△H1CaO(s)+CO2(g)═CaCO3(s)△H2. |