Question

how many moles are in 7.22 x 10^23 formula units of lioh?
? mol lioh
remember 1 mole = 6.02 x 10^23 formula units

Explanation:

Step1: Recall the conversion factor

We know that 1 mole = $6.02\times 10^{23}$ formula - units.

Step2: Set up the conversion

Let $n$ be the number of moles. We use the ratio $\frac{n}{7.22\times 10^{23}\text{ formula - units}}=\frac{1\text{ mole}}{6.02\times 10^{23}\text{ formula - units}}$.
Then $n=\frac{7.22\times 10^{23}\text{ formula - units}}{6.02\times 10^{23}\text{ formula - units/mol}}$.

Step3: Calculate the number of moles

$n=\frac{7.22}{6.02}\text{ mol}\approx1.2\text{ mol}$.

Answer:

$1.2$