A solution prepared by dissolving 0.02 g of unknown substance in water and diluting to a volume of 0.005 L gves an osmotic pressure of 0 01645 atm at 27 °C. What is the molar mass of this unknown substance? (The gas constant is 0.082 atml/molK) For your answer type in only a whole namber without the decimal point by roundng up or down Do not type the unt tat n ginol

A solution prepared by dissolving 0.02 g of unknown substance in water and diluting to a volume of 0.005 L gves an osmotic pressure of 0 01645 atm at 27 °C. What is the molar mass of this unknown substance? (The gas constant is 0.082 atml/molK) For your answer type in only a whole namber without the decimal point by roundng up or down Do not type the unt tat n ginol

Chemistry: Principles and Reactions

8th Edition

ISBN:9781305079373

Author:William L. Masterton, Cecile N. Hurley

Publisher:William L. Masterton, Cecile N. Hurley

Chapter10: Solutions

Section: Chapter Questions

Problem 4QAP: Solutions Introduced directly into the bloodstream have to be isotonic with blood; that is, they...

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Consider two solutions at a certain temperature. Solution X has a nonelectrolyte as a solute and an osmotic pressure of 1.8 atm. Solution Y also has a nonelectrolyte as a solute and an osmotic pressure of 4.2 atm. What is the osmotic pressure of a solution made up of equal volumes of solutions X and Y at the same temperature? Assume that the volumes are additive.
An aqueous solution containing 10.0 g of starch per liter has an osmotic pressure of 3.8 mm Hg at 25 C. (a) What is the average molar mass of starch? (The result is an average because not all starch molecules are identical.) (b) What is the freezing point of the solution? Would it be easy to determine the molecular weight of starch by measuring the freezing point depression? (Assume that the molarity and molality are the same for this solution.)
You have two aqueous solutions separated by a semipermeable membrane. One contains 5.85 g of NaCl dissolved in 100. mL of solution, and the other contains 8.88 g of KNO3 dissolved in 100. mL of solution. In which direction will solvent flow: from the NaCl solution to the KNO3 solution, or from KNO3 to NaCl? Explain briefly.
Vodka is advertised to be 80 proof. That means that the ethanol (C2H5OH) concentration is 40% (two significant figures) by volume. Assuming the density of the solution to be 1.0 g/mL, what is the freezing point of vodka? The density of ethanol is 0.789 g/mL.
A 12-oz (355-mL) Pepsi contains 38.9 mg caffeine (molar mass = 194.2 g/mol). Assume that the Pepsi, mainly water, has a density of 1.01 g/mL. For such a Pepsi, calculate: (a) its caffeine concentration in ppm; (b) its molarity of caffeine; and (c) the molality of caffeine.
Juice (d=1.0g/mL) from freshly harvested grapes has about 24% sucrose by mass. What is the molality of sucrose, C12H22O11, in the grape juice after 25% (by mass) of the water content has been removed? Assume a volume of 15.0 L.
A solution is 4.00% (by mass) maltose and 96.00% water. It freezes at 0.229 C. (a) Calculate the molar mass of maltose (which is not an ionic compound). (b) The density of the solution is 1.014 g/mL Calculate the osmotic pressure of the solution.
The Henry's law constant for the solubility of argon gas in water is 1.0103M/atm at 30C. (a) Express the constant in M/mm Hg. (b) If the partial pressure of argon gas at 30C is 693 mm Hg, what is the concentration (in M) of the dissolved argon gas at 30C? (c) How many grams of argon gas can be dissolved in 29 L of water at 693 mm Hg and 30C? (Ignore the partial pressure of water.)
An aqueous solution made up of 32.47 g of iron(III) chloride in 100.0 mL of solution has a density of 1.249 g/mL at 25C. Calculate its (a) molarity. (b) molality. (c) osmotic pressure at 25C (assume i=4). (d) freezing point.
How can it be demonstrated that colloidal particles are electrically charged?
Solutions Introduced directly into the bloodstream have to be isotonic with blood; that is, they must have the same osmotic pressure as blood. An aqueous NaCl solution has to be 0.90% by mass to be isotonic with blood. What is the molarity of the sodium ions in solution? Take the density of the solution to be 1.00 g/mL.
Antifreeze solutions are aqueous solutions of ethylene glycol, C2H6O2(d=1.12g/mL). In Connecticut, cars are winterized by filling radiators with an antifreeze solution that will protect the engine for temperatures as low as -20F. (a) What is the minimum molality of antifreeze solution required? (b) How many milliliters of ethylene glycol need to be added to 250 mL of water to prepare the solution called for in (a)?