H2(g)+1/2O2(g)=H2O(l)燃烧热H=-285.8kj
CH4(g)+O2(g)=CO2(g)+H2O(l) 燃烧热H=-894.6kj
假设混合气体的平均相对分子质量为 X 两式相加可得:
H2(g)+CH4(g)+(3/2)O2(g)==2H2O(I)+CO2(g)燃烧热H=-1180.4kj/mol
X 1180.4kj
10.4g 651kj
解得:X=18.86
H2(g)+1/2O2(g)=H2O(l)燃烧热H=-285.8kj
CH4(g)+O2(g)=CO2(g)+H2O(l) 燃烧热H=-894.6kj
假设混合气体的平均相对分子质量为 X 两式相加可得:
H2(g)+CH4(g)+(3/2)O2(g)==2H2O(I)+CO2(g)燃烧热H=-1180.4kj/mol
X 1180.4kj
10.4g 651kj
解得:X=18.86