Question

calculate the number of atoms present in 52 moles of He

Answer 1

Do you know Avagrado's number?

Answer 2

You take the amount of moles, multiply by avagrados number, then divide by 1 mol.

Avagrado's number = 6.022 x 10^23 atoms

So, set up the conversion

(52 mol He * (6.022*10^23 atoms He))/ 1 mol He = 34.32 * 10^24 atoms He