12-3 (1)

12-3 (1) - 12 g are KBr and 88 g are water 12 g KBr x 1...

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What is the mole fraction of potassium bromide present in a solution that is 12% by mass aqueous potassium bromide? a) 0.020 b) 0.05 c) 0.1 d) 0.2 e) 1.0 Key: Take a 100 g representative sample of the solution
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Unformatted text preview: 12 g are KBr and 88 g are water 12 g KBr x 1 mol/119 g = approx 0.1 mol KBr 88 g water x 1mol/18 g = approx 5 mol water mole fraction of KBr = moles KBr/total moles = 0.1/5.1 = approx 0.02...
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