# Question #28af1

Oct 25, 2016

$5.6 \times 6.022 \times {10}^{23} \text{atoms}$

#### Explanation:

A mole of ${\text{PCl}}_{3}$ contains

• one mole of $\text{P}$
• three moles of $\text{Cl}$

Therefore, you get a total of 4 moles of atoms per mole of ${\text{PCl}}_{3}$. This means that $1.4$ moles of ${\text{PCl}}_{3}$ contain

$1.4 \times 4 = \text{5.6 moles of atoms}$

Each mole of atoms contains Avogadro's number, $6.022 \times {10}^{23}$, of atoms. Therefore, the sample contains

$5.6 \times 6.022 \times {10}^{23} \text{atoms}$.