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266 solutions

The Colligative Properties

Q. Two aqueous solutions are separated by a semi-permeable membrane: Solution A = 0.34 M KCl Solution B = 0.34 M MgCl2 Which of the following statements is TRUE?

Solved • Feb 3, 2020

The Colligative Properties

Q. Substances A and B are mildly volatile solvents. Using the diagram below, determine the mole fraction of B when the vapor pressure of the mixture is 80 Torr. a) 0.4 b) 0.6 c) 0.2 d) 0.8

Solved • Feb 3, 2020

The Colligative Properties

Q. Catalase (a liver enzyme) dissolves in water. A 14mL solution containing 0.166g of catalase exhibits an osmotic pressure of 1.2 Torr at 20°C. What is the molar mass of catalase? a) 1.49x10^5 g/mol b) 1.69x10^5 g/mol c) 1.81x10^5 g/mol d) 2.81x10^5 g/mol

Solved • Feb 3, 2020

The Colligative Properties

Q. At 293 K, methanol has a vapor pressure of 97.7 Torr and ethanol has a vapor pressure of 44.6 Torr. What would be the vapor pressure of a mixture of 80 g of ethanol and 97 g of methanol at 293 K? a) 71.15 Torr b) 73.70 c) 63.96 Torr d) 78.3 Torr

Solved • Feb 3, 2020

The Colligative Properties

Q. Calculate the vapor pressure at 20°C of a solution containing 0.61g of naphthalene in 16g of chloroform (CHCl3). Naphthalene (C10H8) has a low vapor pressure and may be nonvolatile. The vapor pressure of chloroform at 20°C is 156 torr. a) The vapor pressure would not change as naphthalene is considered non-volatile. b) 28.10 torr c) 150.65 torr d) 20.90 torr

Solved • Feb 3, 2020

The Colligative Properties

Q. A semi-permeable membrane can withstand an osmotic pressure of 0.75 atm. What molarity of aqueous magnesium bromide solution would reach the limit for this membrane? (Assume RT = 25 L.atm.mol^-1) a) 0.01 M b) 0.03 M c) 0.01 mM d) 0.03 mM

Solved • Feb 3, 2020

The Colligative Properties

Q. Rank the following aqueous solutions from lowest to highest boiling point: 0.05 m NaCl, 1 m KCl, 0.5 m BaCl2, and 1 m Ba(NO3)2. All salt are dissolved in water.

Solved • Feb 3, 2020