[學科] 化學計量求平均密度的問題
這邊有一題基測題目麻煩大家幫我看我的推理跟想法答案是否正確
Q:在室溫時,體積為100升的真空密閉容器中,通入28克氮氣和32克氧氣,加熱反應產生NO2氣體,反應式如下:N2+2O2
→ 2NO2
若反應前後容器的體積及溫度不變,則反應後容器內氣體的平均密度為多少克/升?
(A) 0.30??(B) 0.46??(C)
0.60??(D) 0.92
Ans: 因為反應莫耳數比:1:2:2
所以28氮氣跟32克氧氣都是1莫耳 氧氣反應完全
剩下氮氣0.5莫耳(14克) 產生NO2 1莫耳(46克)
所以氮氣密度為D=M/V =14/100=0.14
NO2
密度為:0.46
要求平均密度,所以(0.46+0.14)/2=0.3 答案選A
我個人的想法因為氣體是均勻分布在容器中的:
NO2在100升中的密度是0.46
氮氣在100升中的密度是0.14
所以混合後的密度範圍是介在0.14~0.46之間
請問我這樣想法有任何錯誤請指正 謝謝
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