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Unformatted text preview: Chemistry 2080 Spring 2009 Problem Set #2 - due date: Friday February 6th at 2 pm
Name: Lab TA Name: Lab DayfTime: Practice problems (not graded). Chapter 7: 24, 29, 33. 1) Cayuga Lake has a surface area of about 172 km2 and a volume of 9.4 km3. When the sun is shining brightly in the Summer, it is pouring about 200 watts per meter2 onto the surface of the lake. How many hours of bright
sunshine would be needed to raise the temperature of the surface of the lake, down to a depth of 2 meters, by
10°C? Assume that the energy of the sunshine is captured completely by the top 2 meters of the lake, that there is no loss of heat to the environment during periods of no sunshine, and that the top 2 meters of the lake gets
magically stirred, without mixing with the water below. 2) Under conditions where the products are C02(g) and H200), the complete combustion in oxygen of one mol
of propane(g) (C3Hg) at constant pressure is accompanied by the release of 2,219 k] of heat. How many kg of propane(g) would need to be burned (at constant pressure) in order to raise the temperature of the top 2 meters of
Cayuga Lake by 10°C? Assume that all of the heat generated in the combustion goes to heat the water. 3) The complete combustion of 0.100 mol of methane (CH4) in oxygen in a bomb calorimeter caused the water of the calorimeter to rise in temperature from 25.00°C to 37.70°C. Suppose that the combustion of the 0.1 mol of
methane was instead run at constant pressure (1 atm) in a calorimeter that had a heat capacity (6,973 J/°C) identical
to that of the bomb calorimeter, and that also started at 25.00°C; what would be the ﬁnal temperature of the
water in this calorimeter? Assume that the reactants methane and oxygen, and the product carbon dioxide are all
gases, but that the product water is liquid. (Hint: page 244 of the textbook may help). ...
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- Spring '07