Exam 3 fall 2004 ANSWERS

Exam 3 fall 2004 ANSWERS - Chemistry 105 Exam III Name: _...

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Chemistry 105 Exam III Name: ___________________________________ 1) Which has a larger first ionization energy, germanium or arsenic? Give a brief physical explanation of your answer (NOTE: I am not asking for a rule about location in the periodic table but some difference between the atoms that causes the ionization energy of one to be higher than the other.) (5 pts) As has higher IE because it has larger nuclear charge but same valence shell 2) The vapor pressure of an aqueous calcium chloride solution is lowered by 10% at 25°C. What is the boiling point of the solution in °C? (The K b for water = 0.52 K/m) (15 pts) P solution = 0.90P° = X H2O X H2O = 0.90 = mole H 2 O/(mole H 2 O + mole CaCl 2 ) Assume 1Kg of H 2 O 1000g x 1mol/18 g = 55.56 mole H 2 O 0.90 = 55.56/(55.56+x) 0.90(55.56+x) = 50 + 0.90x = 55.56 x = 6.18 moles molality of solution = 6.18 moles CaCl 2 /1 kg = 6.18 m ΔT b = 3(0.52)(6.18) = 9.64 T b = 109.64 1
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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 fall 2004 ANSWERS - Chemistry 105 Exam III Name: _...

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