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Question

The molar mass of Z is 20g. Find the mass of 1 atom of Z.


A

2.65×10-23g

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B

3.32×10-23g

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C

5.32×10-23g

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D

4.32×10-23g

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Solution

The correct option is B

3.32×10-23g


1 mole = 6.022×1023atoms

Molar mass = 20g

So, 6.022×1023atoms of Z weigh 20g.

1 atom weigh 3.32×1023 g.


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