1.
(2021高二上·三亚月考)
已知:CH4(g)的燃烧热为-890.31kJ•mol-1 , 则下列热化学方程式正确的是( )
A . CH4(g)+2O2(g)=CO2(g)+2H2O(l) △H=+890.31kJ•mol-1
B . CH4(g)+2O2(g)=CO2+2H2O(g) △H=-890.31kJ•mol-1
C . CH4(g)+O2(g)=CO(g)+2H2O(l) △H=-890.31kJ•mol-1
D . CH4(g)+2O2(g)=CO2(g)+2H2O(l) △H=-890.31kJ•mol-1