An aqueous solution of CuX, where X is a polyatomic anion, is prepared by dissol

Question

An aqueous solution of CuX, where X is a polyatomic anion, is prepared by dissolving 11.59 grams of the electrolyte in 300 mL of water. The solution freezes at -0.90oC. Assume complete dissociation of CuX.What is X? Please show all work with the correct answer. Thank you!!!!! An aqueous solution of CuX, where X is a polyatomic anion, is prepared by dissolving 11.59 grams of the electrolyte in 300 mL of water. The solution freezes at -0.90oC. Assume complete dissociation of CuX.What is X? Please show all work with the correct answer. Thank you!!!!!

Explanation / Answer

delta Tf = i x Kf x m

0.900 = 2 x 1.86 x molality

molality = 0.242 m

molality = moles / mass of solvent in kg

0.242 = moles / 0.3

moles = 0.0726

moles = mass / molar mass

0.0726 = 11.59 / molar mass

molar mass = 159.68 g/mol

molar mass of Cu = 63.55 g/mol

molar mass of X = 159.68 - 63.55

                           = 96.13 g/mol

so the anion X = SO42-

CuSO4 is the compound

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