Answer:

Explanation:
<u>1. Convert Formula Units to Moles</u>
To do this, we use Avogadro's Number: 6.02*10²³. It is the number of particles (atoms, molecules, formula units, etc.) in 1 mole of a substance. In this case, it is formula units of sodium hydroxide.

Multiply by the given number of formula units.

Flip the ratio so the formula units will cancel.



<u>2. Convert Moles to Grams</u>
For this, we use the molar mass. It is the grams per mole of a substance. We are given this value for sodium hydroxide: 40.0 g/mol

Multiply by the moles we calculated.

The moles cancel.


<u>3. Round</u>
The original measurement of formula units has 3 significant figures, so our answer must have the same. For the number we calculated that is the hundredth place.

The 6 in the thousandth place tells us to round the 2 to a 3.

There are approximately 1.93 grams of sodium hydroxide.