Mass to Moles

Convert a measured mass of a substance into moles, the bridge between the macroscopic and atomic worlds.

$$n=\frac{m}{M}$$

Variables

Symbol	Meaning	Unit
n	Amount of substance	mol
m	Mass	g
M	Molar mass	g/mol

Worked example

For 5 grams of chlorine with M = 35.45 g/mol, n = 5 / 35.45 = 0.141 mol. For 5 grams of sodium with M = 22.99 g/mol, n = 5 / 22.99 = 0.217 mol.

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Part of The Blueprint of Water