You are inspecting your monthly natural gas bill and see that C&BE Gas 1) charges you by the “therm", and that you used 152.60 of them in December. The reverse side of your bill has this definition: "Therm: A unit of heat measurement equal to 100,000 Btu. We calculate your bill based on how many therms of gas you used." You have been reading about "carbon footprints", and want to approximate how much CO2 is released from the natural gas you used in your home last month. You find that natural gas in your region is 96.0% methane and 4.0% ethane on a molar basis. Please assume that therms correspond to the amount of heat that would be released if the natural gas were completely combusted at standard temperature and pressure (reactants and products at 25 °C and 1 atm). a) What are the complete combustion reactions for methane and ethane? b) How many moles of methane and ethane did you use for your home in December? c) If your appliances (furnace, water heater, stove, and oven) were able to achieve complete combustion of the methane and ethane, how many kilograms of CO2 did your home add to your carbon footprint in December?

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