25℃、101kPa下,4g CH4完全燃烧生成CO2和液态水时,放出222.5 kJ的热量,则下列热化学方程式中正确的是( )
A.CH4(g)+2O2(g)=CO2(g)+2 H2O(g ) △H=-890kJ/mol |
B.CH4(g)+2O2(g)=CO2(g)+2 H2O(l ) △H=+890kJ/mol |
C.CH4(g)+O2(g)= CO2(g)+H2O(1) △H=-445kJ/mol |
D.CH4(g)+2O2(g)=CO2(g)+2 H2O(l ) △H=-890kJ |
25℃、101kPa下,4g CH4完全燃烧生成CO2和液态水时,放出222.5 kJ的热量,则下列热化学方程式中正确的是( )
A.CH4(g)+2O2(g)=CO2(g)+2 H2O(g ) △H=-890kJ/mol |
B.CH4(g)+2O2(g)=CO2(g)+2 H2O(l ) △H=+890kJ/mol |
C.CH4(g)+O2(g)= CO2(g)+H2O(1) △H=-445kJ/mol |
D.CH4(g)+2O2(g)=CO2(g)+2 H2O(l ) △H=-890kJ |