NA表示阿伏伽德罗常数，下列判断正确的是 （ ）
A．标准状况下，1L液态水中含有的H+数目为10-7NA
B．常温常压下，16g CH4中的分子数为NA
C．1L 0.2mol/L的FeCl3溶液中Fe3+的数目为0．2NA
D．含NA个Na+的Na2O溶解于lL水中，Na+的物质的量浓度等于1 mol/L
答案：B
A 错误，标准状况，水的离子积小于10-14，故H+数目小于10-7NA
B 正确，16g CH4为1mol，故分子数为NA
C 错误，Fe3+水解，Fe3+的数目小于0．2NA
D 错误，应该是溶于水配成1L溶液。
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| I'll go on a travel to the capital of our country next week. I want to travel 1 train. I will arrive 2 Beijing 3 Sunday, the 4 of May. I'm going to have a free day first, because I'll be tired 5 the long train trip. I want to go shopping on Tuesday. I'll buy some gifts 6 my friends and the members of my family. I will go to the Great Wall on 7 . Then I'll visit the Summer Palace on Thursday, the 8 . Next day I'll pay a visit to the Space Museum. It will take me one day to visit the Palace Museum .Finally, I will come back on 9 .Because I must go to work on Monday. Do you think the one-week visiting sounds 10 ? | ||||
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