87% rties 03/23/18 O This is a Numeric Entry question/it is worth 4 points/You h

Question

87% rties 03/23/18 O This is a Numeric Entry question/it is worth 4 points/You have unlimited attempts/There is no attempt 06 Question (4 points) Calculate the osmotic pressure of each of the following aqueous solutions at 20.00°C: 3rd attempt See Period Part 1 (1 point) 1.00 Mmethanol (CH3OH): 24.026 atm Part 2 (1 point) 9.10 mMMgCl2: 6559 atm Part 3 (1 point) 30.0mL of slycerol (CHO) in 250.0 ml of aqueous solution (density of gycerol - 1.265 g/ml): atm Part 4 (1 point) 24.4 g of CaCla in 350.0 mL of solution 45.16 atm 06:11 > VIEW SOLUTION BoF1

Explanation / Answer

the density of glycerol = 1.265 g/ml

mass = vol. * density  

30 * 1.265 = 37.95 grams

mole = mass/ molar mass = 37.95 / 92.1 = 0.4121 moles

now molarity = moles / total vol (in litres ) total volume = 30+250 = 280 ml or 0.28 L

0.4121/( 0.280) = 1.472 M

osmotic pressure = C * R * T

1.472 * 0.082 * ( 293) 20C = 273+20 + 293 K

= 35.37 atm.

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