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燃烧10gCH4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/molB.CH4(g)+2O2(g)═CO2(g)+2H2O(l)△H=-55.65kJ/mo

题目详情

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

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(  )

42

A. CH4(g)+2O2(g)═CO2(g)+2H2O(l)△H=55.65kJ/mol

4222

B. CH4(g)+2O2(g)═CO2(g)+2H2O(l)△H=-55.65kJ/mol

4222

C. CH4(g)+2O2(g)═CO2(g)+2H2O(l)△H=-890.4kJ/mol

4222

D. CH4(g)+2O2═CO2+2H2O△H=890.4kJ/mol

4222
▼优质解答
答案和解析
10gCH44在氧气中燃烧生成CO22和液态水,放出556.5kJ热量,16g即1molCH44在氧气中燃烧生成CO22和液态水,放出890.4kJ热量,
则热化学方程式为:CH44(g)+2O22(g)═CO22(g)+2H22O(l)△H=-890.4KJ/mol,
故选.