Question

how many atoms of carbon are present in 15 gram of carbon

Answer 1

no. of atoms = (given mass / upon molecular mass)×NA
(15/12)×6.022×10^23
7.5275×10^23gm ....
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Answer 2

hello user

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Given weight= 15 g

Atomic weight of carbon = 12 g

No.of moles = given weight÷atomic weight

= 15÷12

=1.25 mol

Now, no. of moles = no. of atoms÷ Avogadro's number also.

Therefore,

1.25=no.of atoms÷ 6.02×10^23

No. of atoms = 7.528×10^23

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