Exam 3 SP09 CHM 2045

Exam 3 SP09 CHM 2045 - CHM 2045(Instructors Mitchell Exam...

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CHM 2045 (Instructors: Mitchell) Exam 3 (Form Code A) Summer 2009 Instructions: On your scantron sheet enter and bubble in your name , UF ID number (start on the leftmost space and leave any extra spaces blank), and Form Code (see above). You may retain your exam sheet (mark your answers on it and the scantron sheet) and any other sheets. Turn in only your scantron. Check your bubbling carefully – bubbling errors will not be negotiated . This exam consists of 25 multiple choice questions each worth 11.0 points for a total maximum of 275 pts. R = 8.314 J/mol K: 1 atm = 760 mm Hg: Info: (σ1s σ*1s σ2s σ*2s σ2p π2p y = π2p z π*2p y = π*2p z ) 1. The pressure of 6.0 L of an ideal gas in a flexible container is decreased to one-third of its original pressure, and its absolute temperature is decreased by one-half. What is the final volume of the gas? (1) 9.0 L (2) 0.85 L (3) 8.0 L (4) 7.5 L (5) 7.0 L 2. At 46ºC a sample of ammonia gas exerts a pressure of 5.3 atm. What is the pressure when the volume of the gas is reduced to one-tenth (0.10) of the original value at the same temperature? (1) 43 atm (2) 53 atm (3) 63 atm (4) 75 atm (5) 83 atm 3. A compound of P and F was analyzed as follows: Heating 0.2324 g of the compound in a 378-cm 3 container turned all of it to gas, which had a pressure of 97.3 mmHg at 77ºC. Then the gas was mixed with calcium chloride solution, which turned all of the F to 0.2631 g of CaF 2 . Determine the molecular formula of the compound. (1) PF 4 (2) P 2 F 8 (3) P 2 F 4 (4) PF 8 (5) P 2 F 2 4. In alcohol fermentation, yeast converts glucose to ethanol and carbon dioxide: C 6 H 12 O 6 (s) → 2C 2 H 5 OH(ℓ) + 2CO 2 (g) If 5.97 g of glucose are reacted and 1.44 L of CO 2 gas are collected at 293 K and 0.984 atm, what is the percent yield of the reaction? (1) 35.4 % (2) 45.7 % (3) 60.8% (4) 75.5 % (5) 88.9% 5. Predict the hybridization of the central atom in each of the following molecules.

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