下列说法正确的是
A.已知则可以计算CH3—CH3 → CH2=CH2+H2;ΔH =+125.6 kJ/mol |
B.能说明NH3结合H+能力比H2O强:NH3+H3O+=NH+4+H2O |
C.已知下列热化学方程式:2H2(g)+O2(g) ="==" 2H2O(g) △H=-484kJ/mol,则氢气的燃烧热为-242kJ/mol |
D.已知中和热为-57.4kJ/mol ,则NaOH(aq) +CH3COOH(aq)=CH3COONa(aq)+H2O(l);△H =-57.4kJ/mol |