N2(g)+3H2(g)=2NH3(g) 三角形H=-92kJ/mol 已知N三N键能948.9kJ/mol,H-H键能436.0kJ/mol,则N-H键能为?

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N2(g)+3H2(g)=2NH3(g) 三角形H=-92kJ/mol 已知N三N键能948.9kJ/mol,H-H键能436.0kJ/mol,则N-H键能为?
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N2(g)+3H2(g)=2NH3(g) 三角形H=-92kJ/mol 已知N三N键能948.9kJ/mol,H-H键能436.0kJ/mol,则N-H键能为?
N2(g)+3H2(g)=2NH3(g) 三角形H=-92kJ/mol 已知N三N键能948.9kJ/mol,H-H键能436.0kJ/mol,则N-H键能为?

N2(g)+3H2(g)=2NH3(g) 三角形H=-92kJ/mol 已知N三N键能948.9kJ/mol,H-H键能436.0kJ/mol,则N-H键能为?
由反应热与键能的关系计算:
△H= E(N≡N) + 3E(H-H) - 2*3E(N-H)
-92 = 948.9 + 3 *436.0 - 6E(N-H)
E(N-H) = 391.48 (kJ/mol)

设N-H键键能为y
△H=反应物键能之和-生成物键能之和
mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri">△H=反应物键能之和-生成物键能之和
948.9KJ/mol+3×436.0KJ/mol-6y=△H=-92KJ/mol
y=391.48KJ/mol

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