# Question 00f88

May 28, 2017

$2.41 \times {10}^{24} \text{ atoms}$

#### Explanation:

You are given $4.00$ moles of strontium. We also are taught that a mole is just an amount of things. Just like the word "dozen" means "12 things", the word "mole" just means $602$ hexillion things. This is Avogadro's number and is written

$1 \text{ mole} = 6.02 \times {10}^{23}$ things, or this case, atoms.

This equation gives us two possible conversion factors:

Either $\left(1 \text{ mole")/(6.02xx10^23" atoms}\right)$, or $\left(6.02 \times {10}^{23} \text{ atoms")/(1" mole}\right)$

Use the conversion factor which cancels out the "moles" and keeps the number of atoms. So this is the conversion factor with moles in the denominator.

4.00cancel(" moles")xx(6.02xx10^23" atoms")/(1cancel(" mole"))=24.1xx10^23" atoms"#

ANSWER: $2.41 \times {10}^{24} \text{ atoms}$