Question

how many formula units are in 1.5 moles of naoh?
?×10^? formula units of naoh
remember: 1 mole = 6.02×10^23 formula units
enter the coefficient in the green box and the exponent in the yellow box.

Explanation:

Step1: Recall Avogadro's number

1 mole of any substance contains $6.02\times 10^{23}$ formula - units.

Step2: Calculate formula - units for 1.5 moles

We use the proportion. If 1 mole has $6.02\times 10^{23}$ formula - units, then for 1.5 moles, the number of formula - units $N$ is $N = 1.5\times(6.02\times 10^{23})$.
$N=(1.5\times6.02)\times 10^{23}=9.03\times 10^{23}$.

Answer:

Coefficient: 9.03, Exponent: 23