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Unformatted text preview: Chem 288 Quiz 4 April 10, 2000 At 25°C a certain solute is dissolved in pure water to give a solute—mole
fraction of X2 = 0.05. The partial pressure of water is found to change from 19;:25 mm Hg to 19,: 20 mm Hg.
(Take R=82.l 02723 am K “’ mol ” ) 1. Calculate the activity, al, of the water in the solution. w The chemical potential of the water has
(increased, decreased). Underline correct answer. 3. Calculate the change (with sign and in Joules per mole) of its
chemical potential after the solute has dissolved.
(11:10 cmjatm). 4. Calculate the activity coefficient of water in the solution. .5. What is the molality, m2, of the solute in this solution? 7. Suppose the pressure on the solution is changed to bring u. , back
exactly to u} at constant T. a) the pressure should be (increased, decreased). Underline. b) what might this pressure change be called ? c) EXTRA CREDIT. Calculate its value (with sign, in atm), given that the molar volume of the solvent is V, : 50 cm 3 mol “l . ...
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