How do you calculate the moles of a substance?
In order to calculate the moles of a substance, you need to know the mass of the substance and its molar mass. Molar mass is the atomic weight in grams/mol.
How many moles of copper(II) sulfate,
Molar Mass of
Subscript x molar mass =
1 x 63.456g/mol Cu = 63.456g/mol Cu
1 x 32.065g/mol S = 32.065g/mol S
4 x 15.999g/mol O = 63.996g/mol O
Now multiply the known mass x the conversion factor with moles on top and grams on bottom. This will cancel the grams and leave the moles.