Question

Calculate the mass of 3.011 × 1024 atoms of carbon.

Answer 1

Number of carbon atoms = 3.011 × 10²⁴
We know that 12g (atomic mass of carbon) of carbon contains 6.022 × 10²³ carbon atoms.
Mass of 1 atom of carbon = 12/6.022 × 10²³ = 1.99 × 10^-23

Hence, mass of 3.011 × 10²⁴ carbon atoms = 3.011 × 10²⁴ ×1.99 × 10^-23 = 59.9g or 60g (approximately)