Calculate the mass of 3.011 × 10²⁴ atoms of carbon.

Number of carbon atoms = 3.011 × 10²⁴

now, 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

Therefore, the mass of 3.011 × 10²⁴ carbon atoms

= 3.011 × 10²⁴ ×1.99 × 10^-23

= 59.9g or 60g (approximately)