Atomic Mass to Molar Mass Equivalence

Translate an element’s atomic mass in atomic mass units directly into its molar mass in grams per mole, which are numerically equal.

$$M(\text{g/mol})=A(\text{u})$$

Variables

Symbol	Meaning	Unit
M	Molar mass	g/mol
A	Atomic mass (atomic weight)	u

Worked example

Chlorine has atomic mass 35.45 u, so its molar mass is 35.45 g/mol. One mole of oxygen (15.999 u) weighs about 15.999 grams.

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Part of The Blueprint of Water