Question

Calculate the no. of atoms in
(a) 52 moles of He
(b) 52 amu of He
(c) 52 g of He

Answer 1

no of atoms = no of moles * Avagadro Numbe

Answer 2

to get moles from grams:

52g)(g/mol He (from periodic table)) = Moles of He

Answer 3

for amu take the atomic mass unit from periodic table for He

1 atom = He amu
then
52 amu x (1 atom/ He amu)= atoms of He