# Question #1b1d1

Feb 12, 2018

The number of moles in 19.82 g of Mg = 0.815 mol

#### Explanation:

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

where $n =$ number of moles, $m =$ given mass, and $M =$ molar mass.

$n = \text{19.82 g"/"24.3 g/mol}$

$n = \text{0.815 moles}$