Given 3.50 mole of Cu what is the mass of Cu in grams?

2. If a compound contains \( 40 \% \) sulfur and \( 60 \% \) oxygen by mass, what is the empirical formula of the compound? (Atomic masses: \( S=32 \mathrm{~g} / \mathrm{mol}, 0 \) \( =16 \mathrm{~g} / \mathrm{mol} \) )

2. If a compound contains \( 40 \% \) sulfur and \( 60 \% \) oxygen by mass, what is the empirical formula of the compound? (Atomic masses: \( \mathrm{S}=32 \mathrm{~g} / \mathrm{mol}, 0 \) \( =16 \mathrm{~g} / \mathrm{mol} \) )

\( K ( SO _ { 3 } ) + HCl - SO _ { 2 } KCl + H _ { 2 } O \)

How many mols are there in each of the following samples? (convert grams to mols) a. 42 grams of the radioactive isotope Carbon-14

Determine the amount of moles in 12.15 g Mg .