When 2.22 g of a certain molecular compound X are dissolved in 75. g of benzene...
When 2.22 g of a certain molecular compound X are dissolved in 75. g of benzene C6H6, the freezing point of the solution is measured to be 0.5 °C. Calculate the molar mass of X. If you need any additional information on benzene, use only what you find in the ALEKS Data resource. Also, be sure your answer has a unit symbol, and is rounded to the correct number of significant digits.
Homework Answers
pure benzene freezing point = 5.50C
freezing point of solution = 0.50C
Tf
= 5.5 - 0.5 = 5.0
Kf of benzene = 5.12 0C/m
we have a relation
Tf
= Kf x m
m = molality = (W/MW) (1000 / mass of solvent in g)
Tf
= Kf x W x 1000 / MW x mass of solvent
MW = Kf x W x 1000 / mass of solvent x
Tf
MW = 5.12 x 2.22 x 1000 / 75 x 5.0
MW = 30.3 g/mol
answer = MW = 30.3 g/mol
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When 2.22 g of a certain molecular compound X are dissolved in
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