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# PRA029 - Colligative Properties Worksheet 1 If I add 45...

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Colligative Properties Worksheet 1) If I add 45 grams of sodium chloride to 500 grams of water, what will the melting and boiling points be of the resulting solution? K b (H 2 O) = 0.52 0 C/ m and K f (H 2 O) = 1.86 0 C/m. 2) What is the vapor pressure of the solution in problem #1 at 25 0 C? The vapor pressure of pure water at 25 0 C is 3.17 kPa. 3) Which solution will have a higher boiling point: A solution containing 105 grams of sucrose (C 12 H 22 O 11 ) in 500 grams of water or a solution containing 35 grams of sodium chloride in 500 grams of water? For chemistry help, visit www.chemfiesta.com © 2002 Cavalcade Publishing – All Rights Reserved

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Colligative Properties Worksheet – Answers 1) If I add 45 grams of sodium chloride to 500 grams of water, what will the melting and boiling points be of the resulting solution? K b (H 2 O) = 0.52 0 C/ m and K f (H 2 O) = 1.86 0 C/m. To find the melting and boiling points, you’ll first need to find the concentration of the solution. To find the molality, convert grams of sodium chloride to moles (it turns out to be 0.769 moles) and divide
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