问题描述:
燃烧10g CH4生成液态水和气态CO2,放出556.5kJ的热量,以下的热化学方程式正确的是( )A. CH4(g)+2O2(g)═CO2(g)+2H2O(l)△H=55.65kJ/mol
B. CH4(g)+2O2(g)═CO2(g)+2H2O(l)△H=-55.65kJ/mol
C. CH4(g)+2O2(g)═CO2(g)+2H2O(l)△H=-890.4kJ/mol
D. CH4(g)+2O2═CO2+2H2O△H=890.4kJ/mol
最佳答案:
10gCH4在氧气中燃烧生成CO2和液态水,放出556.5kJ热量,16g即1molCH4在氧气中燃烧生成CO2和液态水,放出890.4kJ热量,
则热化学方程式为:CH4(g)+2O2(g)═CO2(g)+2H2O(l)△H=-890.4KJ/mol,
故选.