已知:H-H键的键能为436 kJ/mol,NN键的键能为945 kJ/mol,N-H键的键能为391 kJ/mol。则下列有关工业合成氨反应的热化学方程式正确的是 |
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A. N2(g)+3H2(g)2NH3(g) △H = -93 kJ/mol B. N2(g)+3H2(g)2NH3(g) △H = +1471 kJ/mol C. N2(g)+3H2(g)2NH3(g) △H = +93 kJ/mol D. N2(g)+3H2(g)2NH3(g) △H= -1471 kJ/mol |