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Question

Number of atoms in 12g of 126C is:

A
6
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B
12
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C
6.022×1023
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D
12×6.022×1023
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Solution

The correct option is C 6.022×1023
First, we'll have to calculate the number of moles.
Number of moles = Given weight Molecular Weight
=1212=1mole
1 mole of 126C has an atomic mass of 12g.
And by Avagadro's rule, one mole of the compound contains 6.0223×1023 atoms.
12g of 126C contains 6.0223×1023atoms (Avagadro number of atoms).

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