20. Cholest disease. A solution of 4.82 g of cholesterol in erol is an important

Question

20. Cholest disease. A solution of 4.82 g of cholesterol in erol is an important compound in the body, but in excess has been implicated as a cause of heart 112 g of benzene (CH) has a freezing point of 4.886°C. The chelene point of pure benzene is 5.4550 ; the K, for benzene is5.12/m. What is the molecular weight of 21. Write the word or phrase that best completes each statement or answers the question a) The weakest type of force between particles of a substance is termed Dispersion Strongur b) Are hydrogen bonds stronger or weaker than dipole-to-dipole bonds? c) When the process is called Melhno Bromine (Br) has a freezing point of -7°C and a boiling point of 60°C. Indicate the state or change of state occurring at each temperature -4hr a solid to a liqud Stek. e 60orc: Napsr state d)-5.44°C:

Explanation / Answer

we know that

depression in freezing point is given by

dTf = freezing point of pure solvent - freezing point of solution

dTf = 5.455 - 4.886

dTf = 0.569

now

dTf = Kf x m

0.569 = 5.12 x m

m = 0.111133

now

molality (m) = moles of solute / mass of solvent (kg)

so

0.111133 = moles of solute / 0.112

moles of solute = 0.012447 mol

now

moles of solute = mass of solute / molecular weight of solute

0.012447 = 4.82 / molecular weight of solute

molecular of solute cholesterol = 387.25 g

so

molecular weight of cholesterol is 387.25 g/mol

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