Author: Anonymous

Polyethylene is a synthetic polymer or plastic with many uses. 1.36 g of a polyethylene sample was dissolved in enough benzene to make 100. mL of solution, and the osmotic pressure was found to be 1.86 torr at 25oC. What is the approximate molar mass of the polyethylene?

What volume of a 0.771 M solution of CaCl2 contains 1.28 g of solute?

Which of the following is indicative of the existence of strong intermolecular forces of attraction in a liquid?

Which statement regarding water is true?

1.68 L of an aqueous solution containing 25.00 g of KCl dissolved in pure water is prepared. The molarity of the solution is:

The solubility of O2 in water is 0.590 g/L at an oxygen pressure of around 14.5 atm. What is the Henry’s law constant for O2 (in units of mol/L·atm)?

An ideal solution is formed from a mixture of the nonvolatile solute urea, CO(NH2)2, and methanol, CH3OH. The vapor pressure of pure methanol at 20°C is 89 mmHg. If 4.4 g of urea is mixed with 39.9 g of methanol, calculate the vapor pressure of the methanol solution.

Which of the following chemical or physical changes is an endothermic process?

Which of the following is the correct answer to problem #3?

Which of the following is the correct answer to problem #8?