已知H—H键的键能为436kJ/mol,N—H键的键能为391kJ/mol,根据热化学方程式:N2+3H2=2NH3△H ="-" 92.4 kJ/mol可得N≡N键的键能是( )
A.431 kJ/mol | B.945.6 KJ/mol |
C.649 kJ/mol | D.869 kJ/mol |
已知H—H键的键能为436kJ/mol,N—H键的键能为391kJ/mol,根据热化学方程式:N2+3H2=2NH3△H ="-" 92.4 kJ/mol可得N≡N键的键能是( )
A.431 kJ/mol | B.945.6 KJ/mol |
C.649 kJ/mol | D.869 kJ/mol |