Question 1

A chemist is given a white solid that is suspected of being pure cocaine (molar mass = 303.35 g/mol).When 1.22 g of the solid is dissolved in 15.60 g of benzene,the freezing point is lowered by 1.32°C.The molar mass is calculated from these data to be 303 g.Assuming the following uncertainties,can the chemist be sure the substance is not codeine (molar mass 299.36)? K_f for benzene is 5.12°C/m. Uncertainties Mass of solid = ±0.01 g Mass of benzene = ±0.01 g $\Delta$T (freezing point lowering)= ±0.04°C K_f = ±0.01 Support your answer with calculations.

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Question 2

When 92.0 g of a compound is dissolved in 1000.g of water,the freezing point of the solution is lowered to -3.72°C.Determine the molar mass of the compound.

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Question 3

Diagram and label a vapor pressure diagram for an ideal solution of two volatile liquids.Indicate the deviation predicted by an endothermic heat of solution.

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Question 4

Calculate both the boiling point and the freezing point if 46.0 g of glycerol,C₃H₅(OH)₃,is dissolved in 500.0 g of H₂O.

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Question 5

Calculate the mole fraction of H₂SO₄ in 9.61 M H₂SO₄.The density of the solution is 1.520 g/mL.

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Question 6

Shaving cream is an example of which colloid type?
A)aerosol
B)foam
C)emulsion
D)sol
E)coagulate

Accepted Answer

Shaving cream is an example of a foam, which is a type of colloid where gas bubbles are dispersed in a liquid or solid.

Question 7

What is the percent by mass of ethanol (C₂H₅OH)in a 1.5-m aqueous solution?

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Question 8

A chemist is given a white solid that is suspected of being pure cocaine.When 1.22 g of the solid is dissolved in 15.60 g of benzene,the freezing point is lowered by 1.32°C.Calculate the molar mass of the solid.The molal freezing point constant (K_f)for benzene is 5.12°C/m.

Accepted Answer

The answer of A chemist is given a white solid...

Quiz 11: Properties of Solutions

When 92.0 g of a compound is dissolved in 1000.g of water,the freezing point of the solution is lowered to -3.72°C.Determine the molar mass of the compound.

Diagram and label a vapor pressure diagram for an ideal solution of two volatile liquids.Indicate the deviation predicted by an endothermic heat of solution.

Calculate both the boiling point and the freezing point if 46.0 g of glycerol,C3H5(OH)3,is dissolved in 500.0 g of H2O.

Calculate the mole fraction of H2SO4 in 9.61 M H2SO4.The density of the solution is 1.520 g/mL.

Shaving cream is an example of which colloid type?

What is the percent by mass of ethanol (C2H5OH)in a 1.5-m aqueous solution?

A chemist is given a white solid that is suspected of being pure cocaine.When 1.22 g of the solid is dissolved in 15.60 g of benzene,the freezing point is lowered by 1.32°C.Calculate the molar mass of the solid.The molal freezing point constant (Kf)for benzene is 5.12°C/m.

Calculate both the boiling point and the freezing point if 46.0 g of glycerol,C₃H₅(OH)₃,is dissolved in 500.0 g of H₂O.

Calculate the mole fraction of H₂SO₄ in 9.61 M H₂SO₄.The density of the solution is 1.520 g/mL.

What is the percent by mass of ethanol (C₂H₅OH)in a 1.5-m aqueous solution?

A chemist is given a white solid that is suspected of being pure cocaine.When 1.22 g of the solid is dissolved in 15.60 g of benzene,the freezing point is lowered by 1.32°C.Calculate the molar mass of the solid.The molal freezing point constant (K_f)for benzene is 5.12°C/m.