74. Why is conversion of gaseous nitrogen to ammonia difficult?
(A) Nitrogen gas is very stable
(B) The reaction has a very high activation barrier (about 100 kcal/mole N2)
(C) The overall free energy change is -45.2 kJ/mole
(D) A & B

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統計： A(0), B(1), C(0), D(0), E(0) #2769456