The number of moles in a substance indicates the amount of the substance that contains the same number of particles as 12 g of the Carbon-12 isotope [or equivalent to 6.02 × 10²³] (which is used as a standard in the world of moles).
Now,
if 6.02 × 10²³ atoms are found in 1 mole of C
then let 1.65 × 10²⁴ atoms are found in x
⇒ x = (1.65 × 10²⁴) ÷ (6.02 × 10²³)
= 2.7409 mol
A sample of 1.65 × 10²⁴ atoms of Carbon (C) would contain ~ 2.74 mol
