How many atoms of copper are present in `0.35` mol of pure copper metal ?

Explanation

1 mol of copper metal = `6.022 xx 10^(23)` atoms of Cu .
`therefore` 0.35 mol of copper metal = `0.35 xx 6.022 xx 10^(23)` atoms of Cu = `2.1 xx 10^(23)` atoms of Cu .