You have a solution that contains 25 g of an unknown non-ionizing polymer in a 250...

You have a solution that contains 25 g of an unknown non-ionizing polymer in a 250 mL solution of chloroform (CHCl3 ). The osmotic pressure of this solution at 25 ◦C is found to be 0.056 atm. What is the molecular weight of the unknown solid?

Expert Solution

queen_honey_blossom answered 1 year ago

A solution contains 12.00 g of unknown compound (non-electrolyte) dissolved in 50.0 mL of water. (Assume...

A solution contains 12.00 g of unknown compound (non-electrolyte) dissolved in 50.0 mL of water. (Assume a density of 1.00 g/mL for water.) The freezing point of the solution is -4.95 ∘C. The mass percent composition of the compound is 53.31% C, 11.19% H, and the rest is O. Part A What is the molecular formula of the compound? Express your answer as a molecular formula.

a solution is made by mixing 1.08 g of an unknown non-volatile non-electrolyte with 10.0 g...

a solution is made by mixing 1.08 g of an unknown non-volatile non-electrolyte with 10.0 g of benzene. The freezing point of pure benzene is is 5.5 degrees Celsius. The molal freezing point depression constant, Kf, for benzene is 5.12 degrees Celsius per molale. What is the value of the freezing point depression? What is the molality of the solution? What is the molar mass of the unknown?

A solution containing 0.20 g of an unknown non-electrolyte in 2.50 g of cyclohexane was found...

A solution containing 0.20 g of an unknown non-electrolyte in 2.50 g of cyclohexane was found to freeze at 4.5 oC . What is the molar mass of the unknown substance?

What is the pH of the buffer solution that contains 2.2 g of NH4Cl in 250...

What is the pH of the buffer solution that contains 2.2 g of NH4Cl in 250 mL of 0.12 NH3? Is the final pH lower than the pH of the 0.12 M ammonia solution?

An aqueous solution containing 34.1 g of an unknown molecular (non-electrolyte) compound in 159.9 g of...

An aqueous solution containing 34.1 g of an unknown molecular (non-electrolyte) compound in 159.9 g of water was found to have a freezing point of -1.5 ∘ C Calculate the molar mass of the unknown compound.

A 7.81 g sample of an aqueous solution of nitric acid contains an unknown amount of...

A 7.81 g sample of an aqueous solution of nitric acid contains an unknown amount of the acid. If 23.2 mL of 1.68 M potassium hydroxide are required to neutralize the nitric acid, what is the percent by mass of nitric acid in the mixture?

A 9.15 g sample of an aqueous solution of hydroiodic acid contains an unknown amount of...

A 9.15 g sample of an aqueous solution of hydroiodic acid contains an unknown amount of the acid. If 29.3 mL of 0.506 M sodium hydroxide are required to neutralize the hydroiodic acid, what is the percent by mass of hydroiodic acid in the mixture?

A solution contains 43.0 g of heptane (C7H16) and 46.0 g of octane (C8H18) at 25...

A solution contains 43.0 g of heptane (C7H16) and 46.0 g of octane (C8H18) at 25 ∘C. The vapor pressures of pure heptane and pure octane at 25 ∘C are 45.8 torr and 10.9 torr, respectively. Assuming ideal behavior, calculate each of the following. The vapor pressure of heptane in the mixture. The vapor pressure of octane in the mixture. The total pressure above the solution. What is the concentration of heptane in mass percent? What is the concentration of...

A solution of an unknown acid is prepared by dissolving 0.250 g of the unknown in...

A solution of an unknown acid is prepared by dissolving 0.250 g of the unknown in water to produce a total volume of 100.0 mL. Half of this solution is titrated to a phenolphthalein endpoint, requiring 12.2 mL of 0.0988 M KOH solution. The titrated solution is re-combined with the other half of the un-titrated acid and the pH of the resulting solution is measured to be 4.02. What is are the Ka value for the acid and the molar...

Suppose you have 300 ml of an aquesous solution that contains 30 g of malononitrile. To...

Suppose you have 300 ml of an aquesous solution that contains 30 g of malononitrile. To isolate malononitrile from this aqueous solution you decide to use ether as the organic solvent in your liquid-liquid extraction. The solubility of malononitrile in either at room temperature is 20.0g/ 100mL and in water is 13.3g/100mL. Consider the following: a. How many grams of malononitrile can be isolated with three extractions using 100 mL of ether each time? b. How many grams of malononitrile...

Question