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Question

How many moles are present in 2.1×1024 atoms of calcium?

A
2.3
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B
3.5
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C
5.2×1022
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D
140
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Solution

The correct option is A 3.5

1 mole of calcium has 6.023×1023 atoms.

1 mole 6.023×1023

x 2.1×1024

x=21×10236×1023 =3.5 moles
So, =3.5 moles are present in 2.1×1024 atoms.

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