Answer Total ed al 29. A 75.0 mg sample of a natural product isolated from alfal

Question

Answer Total ed al 29. A 75.0 mg sample of a natural product isolated from alfalla hay a. 100 TaA b. 150 g cavo c. 3200 g 167 in water to make ml. of solution. The solution did not conduct electricity and had an osmotic pressure or 0.246 atm at "was 30. What is the freezing point of an aqueous solution prepared by dissolving 113 g of sodium phosphate (Na PO4, 163.94 g/mol) in 2.50 kg of water? Use the ideal van t Hoff factor. (Kr(water) 1.86'C/m) Ethylene glycol is used commonly as an antifreeze in automobile radiators. A 50:50 mixture of ethylene glycol and water by volume protects down to about-30°F, what is the boiling point in of this soso mixture? (C2H,02, 62.07 g/mol, 1.1132 g/mL, K- 0.94 F/m) 31.

Explanation / Answer

Ans 29

Osmotic pressure = i x M x R x T

Osmotic pressure = 0.246 atm

Solution did not conduct electricity, i = 1

Gas constant R = 0.0821 L-atm/mol-K

Temperature T = 27 + 273 = 300 K

0.246 atm = 1 x M x 0.0821 L-atm/mol-K x 300 K

M = 0.009987 mol/L

Moles of compound = 0.009987 mol/L x 0.100 L

= 0.0009987 mol

Molar mass of compound = mass/moles

= 0.075 g / 0.0009987 mol

= 75.09 g/mol

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