Mole to Mass and Mass to Moles

- Some questions will give you an amount of moles and ask you to determine the mass
- Converting moles to mass only requires one extra step

Example
How many grams of Bauxite (Al2O3) are required to produce 3.5 mol of pure Aluminum?

2Al2O3------> 4Al + 3O2


3.5 mol x 2/4mol =1.75 mol x 102g/1mol
                           =178.5g----> 1.8 x 10^2 g

How many grams of silver nitrate are needed to produce 1.02 mol of silver chloride according to the following unbalanced equation: 2AgNO3 + BaCl-----> Ba(NO3)2 + 2AgCl

1.02 mol x 2/2 =1.02g x 169.9g/1mol = 173.3g
                                                          = 173g