问题
选择题
已知H-H键能为436 kJ/mol,H-N键能为391 kJ/mol,根据热化学方程式:N2(g)+3H2(g)2NH3(g)
ΔH=-92.4 kJ/mol,则N≡N键的键能是 [ ]
A.431 kJ/mol
B.946 kJ/mol
C.649 kJ/mol
D.869 kJ/mol
答案
答案:B
已知H-H键能为436 kJ/mol,H-N键能为391 kJ/mol,根据热化学方程式:N2(g)+3H2(g)2NH3(g)
ΔH=-92.4 kJ/mol,则N≡N键的键能是 [ ]
A.431 kJ/mol
B.946 kJ/mol
C.649 kJ/mol
D.869 kJ/mol
答案:B