Question

you learned how to convert molecules to moles in part a. in part c you converted grams to moles, but the same conversion factor step.
you could also do this in one step by using the conversion factors employed in part a and c to create a new conversion factor that
part d
sodium hydroxide, naoh, is a strong base that is used in industrial synthesis and processes such as making paper.
what is the mass of 2.50×10²³ formula units of naoh (molar mass = 40.0 g/mol)?
express the mass in grams to three significant figures.
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Explanation:

Step1: Convert formula units to moles

Use Avogadro’s number ($6.022 \times 10^{23}$ formula units/mol):
$\text{Moles} = \frac{2.50 \times 10^{22} \text{ formula units}}{6.022 \times 10^{23} \text{ formula units/mol}} \approx 0.04151 \text{ mol}$

Step2: Convert moles to mass

Use molar mass (40.0 g/mol):
$\text{Mass} = 0.04151 \text{ mol} \times 40.0 \text{ g/mol} \approx 1.66 \text{ g}$

Answer:

1.66 g