Question

How many grams are in 8.50 e 23 formula units of NaCl?

a)82.5 g
b)8.25 g
c)85.0 g
d)91.5 g

Answer 1

a)82.5 g

Step-by-step explanation:

To solve this problem we will use Avogadro's number, which states the number of formula units per mole.

• 8.50x10²³formula units ÷ 6.023x10²³ formula units/mol = 1.41 mol

Then we convert 1.41 moles of NaCl to grams, using its molar mass:

• 1.41 mol NaCl * 58.44 g/mol = 82.4 g

The closest answer is option a).