23. A 0.116M ionic solution has an osmotic pressure of 7.8atm at 38?C.
A. Calculate the van't Hoff factor (i) for this solution.
24. Calculate the vapor pressure at 25 ?C of an aqueous solution that is 5.80% NaCl by mass.
25. Potassium perchlorate (KClO4) has a lattice energy of -599 kJ/mol and a heat of hydration of -548 kJ/mol.
A. Find the heat of solution for potassium perchlorate when 10.5g of potassium perchlorate is dissolved with enough water to make 104.9mL of solution.
B. Determine the temperature change that occurs when 10.5g of potassium perchlorate is dissolved with enough water to make 104.9mL of solution. (Assume a heat capacity of 4.05 J/g??C for the solution and a density of 1.05 g/mL.)
26. A saturated solution was formed when 5.85×10?2L of argon, at a pressure of 1.0 atm and temperature of 25 ?C, was dissolved in 1.0 L of water.
A. Calculate the Henry's law constant for argon.
27. An aqueous solution contains 11.4% NaCl by mass
A. What mass of water (in grams) is contained in 2.9L of the vapor above this solution at 55 ?C? The vapor pressure of pure water at 55 ?C is 118 torr. (Assume a van't Hoff factor of 1.9 for NaCl.)
28. What is the freezing point of an aqueous solution that boils at 105.8?C?
30. A solution is prepared from 4.5729g of magnesium chloride and 43.244g of water. The vapor pressure of water above this solution is found to be 0.3628atm at 348.0 K. The vapor pressure of pure water at this temperature is 0.3804 atm.
A. Find the value of the van't Hoff factor i for magnesium chloride in this solution.