chem_1008_prelim_1_review - CHEMISTRY 1008 Optional Review...

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CHEMISTRY 1008 Optional Review Questions for Prelim 1 1. A combustion reaction releases 10.34 kJ of heat. This heat is absorbed by the surrounding 21.5 grams of ice, bringing the H 2 O to a final temperature of 31.5 ° C. What was the initial temperature of the H 2 O? (For H 2 O: c solid =2.05 J/g ° C, c liquid =4.184 J/g ° C, q fusion =6.01 kJ/mol) 2. A 644 J change in internal energy of a sample of solid CO 2 at -78.0 ° C is caused by sublimation and raising the temperature to 65.0 ° C under constant pressure. Calculate the mass of the sample of CO 2 , the change in enthalpy, and the work done. (For CO 2 : c gas =0.850 J/g ° C, q sublimation =7.96 kJ/mol) 3. An average city with a population of 100,000 people will use about 1.0x10 11 kJ of energy each day. Assume all of that energy is derived from the combustion of octane, C 8 H 18 (l), to form CO 2 (g) and H 2 O (g). Using the enthalpy changes for the reactions below, calculate how much octane (in kilograms) would be used by the city of Ithaca (population 30,000) each day. 8C (s, graphite) + 9 H
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This note was uploaded on 11/14/2009 for the course CHEM 207 taught by Professor Smith during the Fall '07 term at Cornell University (Engineering School).

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chem_1008_prelim_1_review - CHEMISTRY 1008 Optional Review...

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