1) What is the molality of ethanol in a solution made by dissolving 14.6 g of et

Question

1) What is the molality of ethanol in a solution made by dissolving 14.6 g of ethanol, C2HsOH, in 53.6 g of water? A) 0.00591 m B) 0.272 m C) 5.92 m D) 272 m E) none of these 2) Determine the molarity of a solution cinl, in 750.0 ml of solution. 2) Determine the molarity of a solution containing 6.76 g BaCl2 in 750.0 mL of solution. A) 3.25 x 102 M B) 2.44×10-2M C) 9.01 × 10-3 M D) 4.33 x 102M E) 9.01 M 3) Calculate is the molality of a solution of 30.1 g of propanol (CH,CH,CH,0) in 152 ml water, if the density of water is 1.00 g/mL 4) How many grams of KBr are required to make 650. mL of a 0.115 M KBr solution?

Explanation / Answer

1)molality of ethanol in solution if 146 g f ethanl are mixed in 53.6 g of water. MW = 46 g/gmol

By definition

Molality = mol solute(gmol) / mass solvent(kg)

mol ethanol = mass/MW = 14.6/46 = 0.317 gmol of ethanol

kg of water = 53.6 /1000 = 0.0536

Molaliy = 0.317/0.0536 = 5.91 wich isletter C

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