Calculate the mole fraction of total ions in an aqueous solution prepared by dissolving 0.400 moles of MgCl₂ in 850.0 g of water. A)0.00841 B)0.0254 C)0.00848 D)0.0248 E)0.0167

Question

Quizplus · Accepted Answer

MgCl2 dissociates into 3 ions (1 Mg2+ and 2 Cl-). Total moles of ions = 0.400 * 3 = 1.2 moles. Moles of water = 850.0 g / 18.015 g/mol = 47.2 moles. Mole fraction of ions = 1.2 / (1.2 + 47.2) = 0.0248.

Calculate the Mole Fraction of Total Ions in an Aqueous