Question

What is the mass of 1.39 mol of `MgO`?

Answer 1

`1` `mol` of magnesium oxide has a mass of `40.30` `g*mol^-1`

Explanation:

So the required mass is `1.39` `cancel(mol)` `xx` `40.30` `g*cancel(mol^-1)` `=` `??` `g`.