Freezing point depression question. Please help me out. I am one stumped girl.?

Question

In addition to the difference in temperature between freezing point of solvent and freezing point of solution and the molal freezing point depression constant for solvent, which of the answers below gives the minimum data required to determine the molecular mass of a nonionic substance by freezing point depression technique?

A) No further information is needed
B) Mass of Solute
C) Mass of solute and mass of solvent
D) Mass of solute and volume of solvent
E) Mass of solute, mass of solvent and vapor pressure of solvent.

Please explain to me which one is the answer

Answer 1

ΔTf =Kf*m

where m is molality = moles of solute /kg of solvent

but mole solute = mass(solute) / MW(solute)

so m=1000* mass(solute) / [MW(solute) * mass(solvent)]
where both mass(solute) and mass solvent are both expressed in g

so

ΔTf =Kf *1000 *mass(solute) / [MW(solute) * mass(solvent)]

so if you know ΔTf and Kf you need to know additionally the mass of solute and mass of solvent, so the answer is (C)

Answer 2

the final formula is delta T = Kf x m , the position delta T is the substitute in temperature from the conventional boiling factor, Kf is a continuing frequently given interior the problem, and m is the molality of the answer. a. To get the freezing factor I first favor delta T. Kf is 30 C/m. The molality will favor to be calculated. molality = moles solute (iodine) / kg solvent (carbon tetrachloride). Convert grams of iodine to moles. 12.28g / 254 g/mol (bear in thoughts iodine is I2) = .0483 mol. kg of CCl4 is discovered by utilizing the density circumstances the quantity so the KILOGRAMS turns into .396 kg. So now the equation will be solved: delta T = 30 x .0483/.396 = 3.sixty six degrees Celsius. which means the hot freezing factor is 3.sixty six deg Celsius below the conventional freezing factor (freezing factor melancholy). So -23 - 3.sixty six = -26.sixty six degrees Celsius. area be is solved interior an similar way. google naphthalene to locate the formula to get the molar mass so that you'll convert to moles.

Answer 3

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