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exam3chem30a

# exam3chem30a - Exam#3 Chem 30A Spring'00 Name R = 0.0821 L...

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Exam #3 Chem 30A Name_________________ Spring '00 R = 0.0821 L atm/ mol K, 1 atm = 760 torr = 760 mm Hg, 1 mol = 6.02 x 10 23 units Heat of fusion = 80. cal/g˚ C Heat of vaporization = 540 cal/g˚ C 1. (10 pts) How many joules of heat energy are needed to convert 455 g of water (liquid) to ice at 0˚ C? 150. KJ 2. (10 pts) Suppose you take 5.6 g of fat and put it in a bomb calorimeter. The bomb calorimeter is composed of 650.0 g of water and is initially at a temperature of at 22 ˚C. If you ignite the fat, what should be the final temperature of the water in the bomb calorimeter. Specific heat H 2 O = 1.0 cal/g ˚C Fat = 9.0 kcal/ gram 100˚ C 3. (6 pts) Circle the hottest temperature (greatest kinetic energy) and put a box around the coldest temperature. circle box 100 ˚F 100 ˚C 100 K 4. (8 pts) Determine if the following statements or reactions describe an exothermic or endothermic process. ( Put EXO for exothermic and ENDO for endothermic)

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a) The products have less energy than the reactants. ____ Exo
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exam3chem30a - Exam#3 Chem 30A Spring'00 Name R = 0.0821 L...

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