0.3 mol的气态高能燃料乙硼烷B
2H
6在O
2中燃烧,生成固态B
2O
3和液态H
2O,放出649.5 kJ的热量。下列热化学方程式中正确的是( )
A.B2H6(g)+3O2(g)====B2O3(s)+3H2O(l);ΔH="+2" 165 kJ·mol-1 |
B.B2H6(g)+3O2(g)====B2O3(s)+3H2O(l);ΔH="-2" 165 kJ·mol-1 |
C.B2H6+3O2====B2O3+3H2O;ΔH="-2" 165 kJ·mol-1 |
D.B2H6(g)+O2(g)====B2O3(s)+H2O(g);ΔH="-2" 165 kJ·mol-1 |