How many atoms are in 3.75 moles of Carbon?

One mole of Carbon contains 6.022x10^23 atoms.

3.75 moles of carbon contains (6.022x10^23) x (3.75) = 2.26x10^24 Atoms.

One mole of every element or compound is equal to 6.022x10^23 number of Atoms or Molecules and this number of atoms is known as Avogadro's Number.