Exam 3 Spring 2005 ANSWERS

Exam 3 Spring 2005 ANSWERS - Chemistry 105 Exam III Name 1...

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Chemistry 105 Exam III Name: ___________________________________ 1) Consider the following endothermic reaction which has come to equilibrium: Fe (s) + 2HCl(aq) H 2 (g) + FeCl 2 (aq) What is the affect of the following changes (just answer with “More Product” or “Less Product”, or “No Effect”). (15 pts) a) Adding more Fe No effect b) Making the reaction vessel smaller (i.e., compressing the system) Less c) Removing H 2 from the system More d) Raising the temperature More e) The pressure of the system is increased by forcing Helium gas into the reaction vessel while keeping the volume constant. No effect 1
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2) An aqueous solution of sodium phosphate (Na 3 PO 4 ) freezes at 271.9 K. If the vapor pressure of pure water is 23.45 torr at 25°C, what is the vapor pressure of this solution at 25°C? (The K f for water = -1.86 K/m) (15 pts) ΔT = 271.9-273.15 = -1.25 = 4(-1.86)m m = 0.168 Assume 1kg of water 0.168 mole of Na 3 PO 4 and 1000g x 1mol/18g = 55.55 mole water X water
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This test prep was uploaded on 04/20/2008 for the course CHEM 105 taught by Professor F during the Fall '05 term at Grove City.

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Exam 3 Spring 2005 ANSWERS - Chemistry 105 Exam III Name 1...

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