# Question #544a2

Nov 1, 2017

Use Avogadro's Number to calculate the number of atoms in a mole

#### Explanation:

Avogadro's Number = $6.0221409 \times {10}^{23} m o {l}^{-} 1$

Avogadro's Number tells you the number of atoms in 1 mole of any element. To calculate the number of atoms, you simply multiply the number of moles you have by Avogadro's number:

Number of atoms = Number of Moles x Avogadro's Number

Worked example

How many atoms of Li in 2.9 moles of Li?

Number of atoms of Li = $2.9 m o l \times \left(6.0221409 \times {10}^{23} m o {l}^{-} 1\right)$
Number of atoms of Li = $1.7464208 \times {10}^{24}$