ch. 11 An aqueous solution is made by dissolving 20.3 grams of copper(II) acetate in 367 grams of water. The molality of copper(II) acetate in the solution is ___

Question

ch. 11

An aqueous solution is made by dissolving 20.3 grams of copper(II) acetate in 367 grams of water.

The molality of copper(II) acetate in the solution is ___



Answer 1

copper(II) acetate = Cu(CH₃COO)₂

molar mass copper(II) acetate = 182 g/mol

20.3 g x 1 mol 1/ 182 g = 0.1115 mols Cu(CH₃COO)₂

367 g water x 1 kg / 1000 g = 0.367 kg

molality = mols/kg = 0.1115 mols / 0.367 kg = 0.304 m (3 sig. figs.)