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Assigned problems _1, answers

# Assigned problems _1, answers - Chemistry 2080 Spring 2011...

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Chemistry 2080 Spring 2011 Problem Set #1 - due date: Friday February 4th at 2 pm Name:___ KEY__________ Lab TA Name:__________________ Lab Day/Time:______________________ 1) Our house here in Ithaca is heated by a propane-fired furnace. This heats the water for baseboard radiators and also supplies general household hot water. The furnace draws from a 500 gallon underground propane tank. At 1:00 pm on November 22, 2010, the suppliers filled the tank with propane, so we will assume that at this time the tank contained 500.0 gallons of liquid propane (density = 582 kg/m 3 ). At 1 pm on January 26, 2011, the tank contained 23.0% of its full capacity. The complete combustion of one mol of propane in air to give carbon dioxide and water vapor is accompanied by the production of 2,220 kJ of heat. (a) Write a balanced equation for the combustion of propane (C 3 H 8 ) to give carbon dioxide (g) and water (g), and then calculate the average number of joules per day generated by the combustion of propane for heating the house. C 3 H 8 (l) + 5O 2 (g) –––––> 3CO 2 (g) + 4H 2 O(g) The tank when full holds 500.0 gallons of liquid propane; 65.0 days later (Nov 22 to Jan 26) there was only 23.0% of the 500 gallons still in the tank. Thus, heating the house for 65.0 days used (500.0 - 0.230 x 500.0) galls

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