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hw3due012510 - (2 If the pure vapor pressures of benzene(C...

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Due Monday January 25 Dr. Matthew P. Augustine Name_________________________________________ Chemistry 2B, Winter 2010 Student ID Number______________________ Homework 3 Lab TA Name and Time______________________ Instructions: Show all of your work in addition to your answer to the following questions on a separate piece of paper. Put your name on this and all pages, staple your work to this page, and turn it in to your TA’s mailbox by 5 PM on Monday January 25, 2010 . (1) How much sodium phosphate Na 3 PO 4 must be added to 1 kg of water to lower the freezing point of water by 1.3 °C?
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Unformatted text preview: (2) If the pure vapor pressures of benzene (C 6 H 6 ) and toluene (C 7 H 8 ) are P ben = 94.6 torr and P tol = 29.1 torr, what are the mole fractions of benzene and toluene χ ben and χ tol in both the liquid and vapor phases above a mixture where the total vapor pressure is P tot = 82 torr? (Note: you must calculate four separate numbers) (3) If the solubility of neon in water is S = 2.5 x 10 –4 M and the partial pressure of neon above the water is 0.5 atm, what is the Henry’s law constant for neon in water?...
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