Question

The number of atoms present in 25 g of carbon is______​

Answer 1

Weight of each carbon = 12g

so ,

No.of atoms present = 25/12 * 10²³ * 63≈ 2.05 * 6 10²³ atoms = 12.5 * 10²³ atoms

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Answer 2

We know that 12g of carbon contains  6 x 10²³ atoms            (1 mole of carbon = 12g)

6x10²³=Avagadro number                                                                   

25g of carbon contains = 25 x 6 x 10²³ / 12

                                       = 12.5 x 10²³ atoms