Question

How many atoms of carbon are present in 15g of carbon

Answer 1

Given mass of carbon=15g

Molar mass of carbon=12

No. of moles=given mass/molar mass

=15÷12=1.25

No. of atoms=No. of moles × Avogadro's number

=1.25 × 6.022 × 10^23

=7.5275× 10^23 atoms

Hence, in 15g of carbon there will be 7.5275×10^23 atoms...

Hope you understood....;)