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笔者在教学过程中遇到一个值得思考的化学平衡题,题文如下。例题.在一个恒容容器中,反应2NO_2=N_2O_4达到化学平衡状态,保持原温度不变,再通入NO_2或者N_2O_4,NO_2的体积分数将如何变化()。A.前者减小,后者增加B.都增加C.前者增加,后者减小D.都减小分析:向容器中添加NO_2或者N_2O_4的效果相同,都会导致体系的压强变大,是平衡向生成N_2O_4的方向移
I encountered in the teaching process a worthwhile chemical balance questions, the inscription is as follows. Example: In a constant volume reactor, the reaction 2NO 2 = N 2 O 4 reaches the chemical equilibrium state, keeping the original temperature constant, and then changing into NO 2 or N 2 O 4 to change the volume fraction of NO 2 (). A. The former decreases, the latter increases B. Increases C. The former increases, the latter decreases D. Both decrease Analysis: The same effect of adding NO 2 or N 2 O 4 to the container will cause the system pressure to be larger and to be balanced To generate N_2O_4 direction