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The Colligative Properties

Q. At 40oC, the vapor pressure of pure cyclohexane, (C6H12) is 185 torr, while the vapor pressure of pure toluene (C7H8) is 59 torr. What is the vapor pressure of a solution made by combining 50 grams of each of the liquids?

Solved • May 6, 2020

Equilibrium Expressions

Q. The equilibrium constant is 5.2 x 10-3 for the reaction Br2(g) <==> 2 Br(g) at 450K. Calculate the Kc and the Kp for the reaction 2 Br (g) <==> Br2(g) at that same temperature?

Solved • May 6, 2020

Mole Fraction

Q. A solution of isopropyl alcohol, C3H7OH, in water has a mole fraction of alcohol equal to 0.38. What is the weight per cent alcohol and the molality of the solution?

Solved • May 6, 2020

Arrhenius Equation

Q. Calculate the Energy of Activation for a reaction if the specific rate constant at 35oC is 3.2 x 10-5 sec-1 and the specific rate constant at 42oC is 5.9 x 10-5 sec-1

Solved • May 6, 2020


Q. Calculate the molality and mole fraction for a solution of 30% (w/W) hydrofluosilicic acid (H2SiF6) that has a density of 1.27

Solved • May 6, 2020

pH and pOH

Q. Determine the [H+], the [OH-] the pOH and the Ka for a solution of a weak acid with a concentration of 0.035 M has a pH of 3.52.

Solved • May 6, 2020

Limiting Reagent

Q. Aqueous hydrochloric acid will react with solid sodium hydroxide to produce aqueous sodium chloride and liquid water . Suppose 5.83 g of hydrochloric acid is mixed with 1.7 g of sodium hydroxide. Calculate the maximum mass of water that could be produced by the chemical reaction. Round your answer to significant digits.

Solved • May 6, 2020