# How many atoms are in a 0.250 mol sample of magnesium (Mg)?

Jun 10, 2018

How many atoms in a $\text{quarter dozen magnesium atoms?}$

#### Explanation:

Two, five, four, or THREE...?

This question is precisely the same as the former...except that ONE mole $\equiv 6.022 \times {10}^{23} \cdot m o {l}^{-} 1$...

And so we take the PRODUCT....$\frac{1}{4} \cdot m o l \times 6.022 \times {10}^{23} \cdot m o {l}^{-} 1$

$\cong 1.5 \times {10}^{23} \cdot \text{magnesium atoms}$...what is the mass of this quantity?