Using the information in the table, calculate the number of formula units in a 27.4 g sample of calcium chloride (CaCl2).

1.49×10²³ formula units.

Explanation:

From Avogadro's hypothesis, we understood that 1 mole of any substance contains 6.02×10²³ formula units. This implies that 1 mole of CaCl2 also contains 6.02×10²³ formula units.

Next, we shall determine the mass of 1 mole of CaCl2. This is illustrated below:

1 mole of CaCl2 = 40.08 + (2×35.45)

= 40.08 + 70.9

= 110.98 g

Finally, we shall determine the number of formu units in 27.4 g of CaCl2. This is illustrated below:

From Avogadro's hypothesis,

110.98 g of CaCl2 also contains 6.02×10²³ formula units.

Therefore, 27.4 g of CaCl2 will contain = (27.4 × 6.02×10²³) / 110.98 = 1.49×10²³ formula units.

Thus, 27.4 g of CaCl2 contains 1.49×10²³ formula units.

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