Question

how many atom of carbon are present in 15 g of carbon

Answer 1

Answer:

7.5 x 10 *23

Explanation:

12 g of carbon contains 6x 10*23 atoms

then 15 g contains (6/12)x15 x 10 *23= 7.5 x 10 23 atoms

Answer 2

Answer:

7.5275 × 10^23

Explanation:

Given Mass of carbon = 15g

Molar Mass of carbon = 12g

No: of moles = given mass ÷ Molar mass

15 ÷ 12 = 1.25

No: of atoms = Moles × Avogadro's Number

= 1.25 × 6.022 × 10^23

= 7.5275 × 10^23

Hence , 15 g of carbon has

7.5275 × 10^23 atoms