25℃和1.01×105Pa时，反应2N2O5（g）=4NO2（g）+O2（g）
； △H=＋56.76kJ/mol，自发进行的原因是
：（ ）
| A．是吸热反应 | B．是放热反应 |
| C．是熵减少的反应 | D．熵增大效应大于能量效应 |
相关试题
All the dishes in this menu, ______ otherwise stated, will serve two to three people. 
| A．as | B．if | C．though | D．unless |
The children loved their day trip, and they enjoyed the horse ride ______.
| A．most | B．more | C．less | D．little |
Progress______ so far very good and we are sure that the work will be finished on time.
| A．was | B．had been | C．has been | D．will be |
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| A．someone | B．anyone | C．not one | D．no one |
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