A 62.2 g sample of aluminum sulfide has 2.49 * 10²³ formula units.
A mole is defined as 6.022 * 10²³ of atoms , molecules , ions or others.
It is given in the question to find the number of formula units in 62.2 g sample of Aluminum Sulfide.
To determine no. of formula units , No. of mole needs to be determined
Molecular Weight of Aluminum Sulfide is 150.158 gm
150.158 g of Aluminum Sulfide makes 1 mole
62.2 g will make 62.2 * 1 / 150.158 = 0.414 moles
1 mole = 6.022 * 10²³ formula units.
0.414 moles = 0.414 * 6.022 * 10²³
= 2.49 * 10²³ formula units.
Therefore , a 62.2 g sample of aluminum sulfide has 2.49 * 10²³ formula units.
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