How many atoms are in 4.81 mol of pure aluminum?

Answer 1

1 mole of ANY element contains 6.02x10²³ atoms of that element (Avogadro's number)

4.81 moles x 6.02x10²³ atoms/mol = 2.90x10²⁴ atoms

Answer 2

According to the periodic table, Al has a molar mass of 26.982 g/mol.

To find your answer, use dimensional analysis:

26.982 g* mol^-1 * 4.81 mol.

= 129.8 783g -> 130.0g after significant figures.