Question

Calculate the number of atoms of each kind in 5.3 grams of Sodium carbonate

Answer 1

no of moles in 5.3 grams Na2CO3 are

5.3/106 = 0.05 moles

number of atoms = 0.05 × 6.022 × 10²³

Answer 2

Molar mass of sodium carbonate = 106u

Mole = given mass / molar mass

= 5.3/106 = 0.05 mole

1mole contains 6.02 × 10^23 atoms

Then no of atom in 0.05 moles = 0.05 × 6.02 × 10^ 23atom

= 3.011 × 10^22 atom

Ans= 3.011 × 10^ 22atom