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Exam%201%20Key - 1 123 Exam 1, Fa112006 EXAM 1B CHEMISTRY 1...

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1 123 Exam 1, Fa112006 EXAM 1 B CHEMISTRY 1 123 September 19,3006 Name: Rules: No talking, No trading Calculators, No explosive flatulence, No use of any materials except pencil and ~alculator,'~lace answer on scantron. 1. How much heat, in kJ is required to vaporize 2.05 kg of octane? Things you may need: AHvap(octane) is 41.5 kJlrnol; molar mass of octane is 1 14 glmol. 4) 746 kJ B) 1.34 1 2. How many grams of propane must be burned to supply the heat required to vaporize 3.75L of water at 25 OC, via the following reaction which will liberate 2,220 (as written): C3Hs(g) +- 502 + 3CO2(g) + 4H2O(I) Things you may also need: AHvap(H20) is 44.0 kJlmo1; density of water is 1 g/mL; n~ular mass of propane is 44 glmol, water is 1 8 g/mol. A) 1.9X lo-' g I B) 8.7 X lo-' g C) 193 g '4*~%rGp ,(w~~r\;p *%\5 181 g E) 4.2 Mg I 1 C) 3.2 U D) 2.3 k~ I ihie E) 1.3~10-~k~ 3. How much heat, in kJ, is required to melt an ice cube that 5 cm square. Some stuff you may need: The '2 # cs-0 rj T ; f4k (CF density is 0.92 g/cmJ; AHfus(H1O) is 6.0 1 kJ/rnol; molar mass H20 18 gimol.; eight grade geometry. 3) 38.4 B) 1.5 kJ C', 0.65 kJ
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1 123 Exam 1, Fa112006 4. If 25 0. grams of water is placed in a chamber at 25 OC and the expanded to a volume 1,000. L, How many grams of will evaporate? Some stuff you will need for tbis: The vapor pressure of at 25.0 is 23.8 mmHg, Molar mass is 18&nol. 5. Consider the phase diagram COz shown above. The letters indicate specific points the phase diagram. In going from point A to B to C, what transitions does C& undergo?
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This note was uploaded on 04/16/2008 for the course CHEM 1123 taught by Professor Paul during the Fall '06 term at Arkansas.

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Exam%201%20Key - 1 123 Exam 1, Fa112006 EXAM 1B CHEMISTRY 1...

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