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Assignment 21 Chapter 136 Nhat osmotic pressure (in atmospheres) would you expect for each of the following solutions? Part A 4.38 g of NaCl in 302.0 mL of aqueous solution at 50 °C. ΡΟΙ ΑΣφ o ? II = atm Submit Request Answer Part B 6.79 g of sodium acetate, CH, CO Na, in 57.0 mL of aqueous solution at 15°C. Η ΑΣφ ? ? II = atm Submit Request Answer Focus h (United States) MA X 15
molar mass mass in grams number of moles This quantity can be determined experimentally by accurately measuring the mass of the sample and determining the corresponding number of moles based on some property of the sample. Freezing- point depression and osmotic pressure measurements are frequently used to calculate the number of moles in solution for this type of determination. Freezing-point depression is equal to AT = Km where AT is the change in temperature, Kf is the molal freezing-point-depression constant, and mis the molality in moles of solute per mass of solvent. Osmotic pressure is equal to II = MRT where II is the osmotic pressure, R=0.08206 L.atm/(K.mol), T is temperature, and M is molarity in moles per liter of solution. Part B A protein subunit from an enzyme is part of a research study and needs to be characterized. A total of 0.160 g of this subunit was dissolved in enough water to produce 2.00 mL of solution. At 28°C the osmotic pressure produced by the solution was 0.138 atm. What is the molar mass of the protein? Express your answer with the appropriate units. View Available Hint(s) НА Value Units