How many molecules are in 95.75 g of calcium chloride?

5.195 x 10²³ molecules ≅ 5.2 x 10²³ molecules.

Explanation:

n = mass/molar mass = (95.75 g)/(110.98 g/mol) = 0.86 mol.

Using cross multiplication:

1.0 mole of CaCl₂ contains → 6.022 x 10²³ molecules.

0.86 mole of CaCl₂ contains → ??? molecules.

∴ 95.75 g of CaCl₂ (0.86 mole) contain = (0.86 mol)(6.022 x 10²³) = 5.195 x 10²³ molecules ≅ 5.2 x 10²³ molecules.

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