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# Assigned problems _1 answers - Chemistry 2080 Spring 2009...

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Chemistry 2080 Spring 2009 ANSWERS to Problem Set #1 - due date: Friday February 5th at 2 pm Name:________________ Lab TA Name:__________________ Lab Day/Time:______________________ 1) The heat of combustion of methane gas in air or oxygen is - 890 kJ/mol of methane, the products being liquid water and gaseous carbon dioxide. The figure for the similar combustion of carbon (graphite) is - 393.5 kJ/mol of carbon, but in this case the product is just carbon dioxide gas. Suppose that you want to heat a full 40 gallon tank of water from 15° C up to 65° C using the combustion of (a) methane, or (b) carbon (graphite) as a source of heat. Calculate the volume of carbon dioxide , measured at 25° C and 1 atmosphere pressure, that is produced in case (a) and then do the same for case (b). You can ignore the heat capacity of the water tank itself, and can assume that the heat from either combustion goes 100% to heat the water. State any other assumptions or simplifications that you make. (As a footnote, this type of calculation, and an awareness of the greenhouse gas status of carbon dioxide, is being used to encourage moving from coal-fired steam generation to natural-gas-fired steam generation. Unfortunately

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