Question

What is the mass in grams of 3.50 mol of the element copper, Cu?

Answer 1

The mass in grams of 3.50 mol of the cu element is calculated as follows
mass = moles x molar mass of Cu(63.5 g/mol)
= 3.50 moles x 63.5 g/mol)=222.25 grams

moles and moles cancel out each other