In a research lab that is studying over the counter pain medications, a biochemi

Question

In a research lab that is studying over the counter pain medications, a biochemist dissolves 10.0 mg of a drug in water to make a solution with 1.50 mL final volume, giving a solution with a density of 1.001 g/mL. When freezing the solution, she found that the solution freezes at -0.083 ºC. Which compound could this be?

Drug

Molar mass (g/mole)

Experimental Van’t Hoff

Advil

206.29

1.02

Aleve

230.26

1.82

Aspirin

180.16

1.05

Tylenol

151.16

1.00

Drug

Molar mass (g/mole)

Experimental Van’t Hoff

Advil

206.29

1.02

Aleve

230.26

1.82

Aspirin

180.16

1.05

Tylenol

151.16

1.00

Explanation / Answer

Ans delta Tf = i kf m

Kf (H2O) = 1.86

-0.083 = - 1 * 1.86 * (0.010/1.5 *M) *1000

M = 1.86* 0.010 * 1000 /(0.083*1.5)

M = 149.31 g per mol

Hence the drug is Tylenol

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