Chemistry
Moles and Mass
Calculate the amount of substance in moles.
Number of moles (n) = Mass (m) / Molar mass (M)
Formula Explanation
Divide the sample mass by its molar mass.
Variables Explained
n = Amount in moles; m = Mass in grams; M = Molar mass in g/mol.
Solved Example
How many moles are present in 36 g of water? Molar mass = 18 g/mol.
n = 36 / 18 = 2 mol.