Question

11.37 and 11.39

The thermostat in a refrigerator filled with cans of soft drinks malfunctions and the temperature of the refrigerator drops below 0 degree C. The contents of the cans of diet soft drinks freeze, rupturing many of the cans and causing an awful mess. However, none of the cans containing regular, nondiet soft drinks rupture. Why? Why is it important to know if a substance is a strong electrolyte before predicting its effect on the boiling and freezing points of solvent? Why are the van 't Hoff factors of electrolytes greater than those of nonelectrolytes? Why are theoretical and experiment van't Hoff factors of electrolytes sometimes different? Can experimentally measured value of a van 't Hoff factor be greater than the theoretical value? Why or why not? A solution contains 3.5 mol of water and 1.5 mol of glucose (C_6H_12O_6). What is the mole fraction of water in the solution? What is the vapor pressure of the solution at 25 degree C, given that the vapor pressure of pure water at 25 degree C is 23.8 torr? A solution contains 4.5 mol of water, 0.3 mol of sucrose (C_12H_22O_1), and 0.2 mol of glucose. Sucrose and glucose are nonvolatile. What is the mole fraction of water in the solution? What is the vapor pressure of the solution at 35 degree C, given that the vapor pressure of pure water at 35 degree C is 42.2 torr? Calculate the molality of each of the following solutions: 0.875 mol of glucose (C_6H_12O_6) in 1.5 kg of water 11.5 mmol of acetic acid (CH_3COOH) in 65 g of water 0.325 mol of baking soda (NaHCO_3) in 290.0 g of water Table 8.1 lists molar concentrations of major ions in seawater. Using a density of 1.025 g/mL for seawater, convert the concentrations into molalities.

Answer 1

Department of Civil EngineeringExperiment No.: Date: Page No.: Given moles ef water m soutron 3.5 molesTePet motes af 9Iucase n Solurion 1.5 molesVaPrras a Pure wair220l 25 C ndwaal masses hill be 드180 gns Solutron mibe vapour pressure af solution at 2s2 fin-Vapour pressure q1 X Mdf 25oc Synat2s'e 23.8x07-16-66 torr a) Moles Solutey/kg-Solvere : = oa7s mel af glucose (gien) & kg solvert I of water ien 0,065 kgs of water. rn c Likeniše 3 0 32 1.12 mol/ Signature of Faculty innHOL PATFL INSTITUTE OF