Home Homework Help

Browse Homework Solutions

8,005 solutions

Equilibrium Expressions

Q. Ammonia has been studied as an alternative “clean” fuel for internal combustion engines, since its reaction with oxygen only produces nitrogen and water vapor. An industrial chemist studying this reaction fills a 500.0 mL flask with 0.70 atm of ammonia gas and 1.7 atm of oxygen gas at 37.0 deg C. She then raises the temperatures and when the mixture has come to equilibrium measures the partial pressure of water vapor to be 0.63 atm. Calculate the pressure equilibrium constant for the combustion of ammonia at the final temperature of the mixture

Solved • Sep 17, 2019

The Colligative Properties

Q. An aqueous solution is 10.0% glucose by mass (d = 1.039 g/mL at 20 degrees C). Calculate its freezing point, its boiling point at 1 atm, and its osmotic pressure.

Solved • Sep 14, 2019

The Colligative Properties

Q. In a study designed to prepare new gasoline-resistant coatings a polymer chemist dissolves 6.053 g of poly(vinyl alcohol) in enough water to make 100.0 mL of solution. At 25 degrees C, the osmotic pressure of this solution is 0.272 atm. What is the molar mass of the polymer sample? Enter your answer in scientific notation.

Solved • Sep 14, 2019

The Colligative Properties

Q. What is the minimum mass of ethylene glycol (C2H6O2) that must be dissolved in 14.5 kg of water to prevent the solution from freezing at -10.0 degrees F? (Assume ideal behavior.)

Solved • Sep 14, 2019

Periodic Table

Q. Which ions are isoelectronic with Ne? Li+ Mg2+ 02- F-

Solved • Sep 17, 2019

Freezing Point Depression

Q. Calculate the molality and van't Hoff factor (i) for the following aqueous solution: 0.450 mass % KCl, freezing point = -0.210 degrees C

Solved • Sep 14, 2019

The Colligative Properties

Q. Calculate the vapor pressure of a solution 38.5 g of glycerol (C3H8O3) in 500.0 g of water at 25 degrees C. The vapor pressure of water at 25 degrees C is 23.76 torr. (Assume ideal behavior.)

Solved • Sep 14, 2019