Calculate the molar mass of the polymer. Hint: convert height h to pressure in P

Question

Calculate the molar mass of the polymer. Hint: convert height h to pressure in Pa, concentration c to kg/m^3, and plot (pressure/c) vs c. Find relationship between M and the slope of this curve. Download the PDF: here for help. A dilute of bromine in carbon tetrachloride behaves as an ideal dilute solution. The vapor pressure of pure CCI4 is 33.85 Torr at 298 K. The Henry's law constant when the concentration of Br2 is expressed as a mole fraction is 122.36 Torr. Calculate (a) the vapor pressure of each component. (b) the total pressure= (c) the composition of the vapor phase =

Explanation / Answer

a). PBr2 = KBr2 XBr2 XBr2 = (0.050 Torr)/(122.36 Torr) = 0.00041 (this is the mole fraction of Br2 in solution)

This means that XCCl4 = 1 - XBr2 = 0.99959 (this is the mole fraction of CCl4 in solution)

For the solvent use Raoult's law:

PCCl4 = P*CCl4 XCCl4 = (33.85 Torr)(0.99959) = 33.836 Torr

b).the total pressure=33.836+122.36 +0.050 =156.246 Torr

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