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Question

1 mole of He gas has 6.022×10x atoms. x is _____


A

20

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B

23

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C

25

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D

30

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Solution

The correct option is B

23


He is a noble gas. Thus, it is monoatomic.
Thus, the unit of He gas is He atom itself.

Thus, 1 mole of He gas = 6.022 × 1023 atoms of He.


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