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Exam3FormCodeAWithAnswers - CHM 2045 Exam 3(Form Code A...

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CHM 2045 Exam 3 (Form Code A) Spring 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 9.0 points for a total maximum of 225 pts. 1. Carbon monoxide (g) reacts with oxygen (g) to form carbon dioxide (g). In a 1.00 L flask, 2.40 atm of CO reacts with 4.50 atm of O 2 . Assuming that the temperature remains constant, what is the final pressure in the flask? (1) 1.20 atm (2) 2.40 atm (3) 3.30 atm (4) 3.60 atm (5) 5.70 atm 2. A 1L steel tank has a safety valve that opens when the internal pressure exceeds 850 torr. The tank is filled with He at 23 o C and 0.991 atm. To what temperature ( o C) will the tank need to be heated for the safety valve to open? (1) 100 (2) 62 (3) 339 (4) 273 (5) 173 3 . If an ideal gas is contained in a piston/cylinder and P is doubled while T is increased from 200 o C to 400 o C, the density of the gas (1) does not change (2) increases by a factor of ~1.9 (3) decreases by a factor of ~1.4 (4) increases by a factor of ~1.4 (5) decreases by a factor of ~1.9 4. A gas has a density of 2.09 g/L at 100 o C and 1 atm. What is the molar mass of the gas? (1) 17 g/ mol (2) 31 g/mol (3) 47 g/mol (4) 64 g/mol (5)130 g/mol 5. Use the normal boiling point of I 2 (184 o C) and the triple point conditions (0.12 atm,114 o C) to calculate the heat of vaporization ( H vap ) of I 2 . (1) 5.3 kJ/mol (2) 7.0 kJ/mol (3) 45 kJ/mol (4) 53 kJ/mol (5) 59 kJ/mol 6. For ideal gas behavior, the molecules are assumed to have no interaction with each other. For real gas behavior, intermolecular forces exist among the molecules.

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Exam3FormCodeAWithAnswers - CHM 2045 Exam 3(Form Code A...

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