Youare studying an Alzheimer, chemistry homework help

timer Asked: May 19th, 2016
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Question Description

You are studying an Alzheimer’s brain protein for Dr. Durrant which is a tau protein.  It is believed to have a mass between 55,000 and 62,000 g/mol.  You have been given the task of determining its actual molecular mass.  If you assume a mass of 58,500 g/mol, and were to dissolve 5.00 mg in 1.00 mL water, calculate the freezing point depression of this solution, boiling point elevation of this solution, the vapor pressure change (from 23.76 Torr at 25°C) for the solution, the osmotic pressure for the solution, and the height of a column of water corresponding to this osmotic pressure.  Which method would you use to experimentally determine the molecular mass of this polymer, and why?

Tutor Answer

School: UC Berkeley

Note that 5e-6 is the shorthand notation of fully writing out the value of 5 x 10^-6- Freezing point depressionThe freezing point depression of a solution is calculated using the formula deltaT = i*K(f)*m,where i (the van't Hoff factor) = 1 (since the protein does not dissociate when dissolved), and K(f) for water = 1.86 C/molthe molality (m) of the solute in the solution is 8.55e-8 mol / 0.001 kg water = 8.55e-5 NSo, deltaT = 1 * 1.86 * 8.55e-5 = 1.59e-4 degree...

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Good stuff. Would use again.

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