Calculate the molality of a solution formed by dissolving 34.8 g of Lil in 500.0

Question

Calculate the molality of a solution formed by dissolving 34.8 g of Lil in 500.0 mL of water A) 0.254 m B) 0.130 m C) 0.696 m D) 0.260 m E) 0.520 m Answer: E Diff 2 page Ref: 12.5 21) Calculate the mole fraction of the total ions in ana aqueous solution prepared by dissolving 0.400 moles of MgBr_2 in 850.0 g of water. (electrolyte = 3 different ions = 3 times 0.400 moles = 1.2 moles) A) 0.00841 B) 0.0270 C) 0.00900 D) 0.0252 E) 0.0167 Answer: D Diff 3 page Ref: 12.5 22) Calculate the mole fraction of Cal_2 in an aqueous solution prepared by dissolving 0.400 moles of Cal_2 in 850.0 g of water. A) 0.00841 B) 0.0270 C) 0.0090 D) 0.0252

Explanation / Answer

19)

m = 34.8g of LiI

MW = 133.8455

V = 500 ml

m = 500 g = 0.5 kg

mol = 34.8/133.8455 = 0.260001

molal = mol/kg = 0.260001/0.5 = 0.520002

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