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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 kJ 1 2. How many grams of propane must be burned to supply the heat required to vaporize 3.75L of water at 25 O C , via the following reaction which will liberate 2,220 kJ (as written): C3Hs(g) +- 5 0 2 + 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 4) 181 g E) 4.2 Mg I 1 C) 3.2 U D) 2.3 k~ I i h i e E) 1 . 3 ~ 1 0 - ~ k ~ 3. How much heat, in kJ, is required to melt an ice cube that is 5 cm square. Some stuff you may need: The '2 # cs-0 rj T ; f 4 k (CF density of ice is 0.92 g/cmJ; AHfus(H1O) is 6.0 1 kJ/rnol; molar mass H20 is 18 gimol.; eight grade geometry. 3) 38.4 kJ 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 chamber expanded to a volume of 1,000. L, How many grams of water will evaporate? Some stuff you will need for tbis: The vapor pressure of water at 25.0 OC is 23.8 mmHg, Molar mass of water is 18&nol.
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Exam%201%20Key - 1 123 Exam 1 Fa112006 EXAM 1B CHEMISTRY 1...

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