Question

The mass of single atom of an element is 2.65 × 10⁻²³ g. Calculate its atomic mass. [NA= 6.022 × 10²³ mol⁻¹ ] 

Answer 1

Mass of 1 atom = 2.65 × 10⁻²³ g 

Therefore, mass of 6.022 × 10²³ atoms 

= 2.65 × 10⁻²³× 6.022 × 10²³ g = 15.96 g ≈ 16 g mol⁻¹ 

Therefore, the atomic mass of the element is 16 u.