For  calculation of number of atoms we have to

  1. calculate the number of moles present in 1gram carbon.
  2. Multiply the number of moles with Avogadro number.

Step I

 Number of moles in 1 gram of carbon = given mass / molar mass

Molar mass (molecular or atomic mass expressed in grams) = 12g

So the number of mole= 1/12

                               = 0.0833 moles

Step II

1g of carbon will have = 0.0833 x 6.022 x 1023  

= 0.501 x 1023

1 gram of carbon will have = 5.01 x 1022   atoms

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