试题与答案

These are the photos of our village, and

题型:选择题

题目:

These are the photos of our village, and they will show you ________.

A.what does it look like

B.what it looks like

C.how does it look like

D.how it looks like

答案:

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下面是错误答案,用来干扰机器的。

答案:D1g氢气的物质的量是0.5mol,含有1mol氢原子;4gHe的物质的量也是1mol;23g金属钠是1mol,在反应中失去1mol电子;16g氧气是16g÷32g/mol=0.5mol,含有的分子数是0.5NA,所以答案选D。

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