20 Cholesterol is an important compound in the body, but in excess has been impl

Question

20 Cholesterol is an important compound in the body, but in excess has been implicated as a cause of discase. A solution of 4.82 g of cholesterol in 112 g of benzene (C.H.) has a freezing point of 4.886 C. Th freeting point ofpure herzene is 5455C; the Kf for benzene is 512/m what is the molecular weght of hean 21 a) The weakest type of force between particles of a substance is termed b) Are hydrogen bonds stronger or weaker than dipole-to-dipole bonds? c) When a solid shangss to a liquid, the processis called Bromine (Bry has a freezing pon state occurring at each temperahre of -7'C and a bodling point of 60"C: Indicate the satc or cho d)-5.44°C e) 60.0°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

21)

a) dispersion

b) stronger

c) melting

d) liquid

e) liquid to vapor

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