How many moles are in 4.85×1023 atomsof gold?

Answer 1

1 mole Au atoms has 6.02E23 atoms Au so
4.85E23 atoms Au x (1 mol Au/6.02E23 atoms Au) = ?
Note the "atoms Au" cancel and you're left with mols Au as a unit and that's what you want; i.e., mols Au in the answer.