Chapter 20, Problem 2P

1) Heating the water in a 55-gallon water heater requires about 2.0 x 103 kJ of energy.          a) Assume the energy came from natural gas with 80% efficiency; how many grams of natural gas are required?          b) Assume the energy came from electricity with 80% efficiency and that the electricity was produced from the combustion of coal with 30% efficiency; how many grams of coal are required?   For problem above, calculate how much CO2 in grams is emitted to the atmosphere.             For a: Use the balanced equation for the combustion of methane (CH4) to determine how many grams of CO2are produced from the amount of natural gas required.             For b: Assume that coal produces 5.25 kJ of energy per gram of CO2 produced. Calculate how much CO2 in grams is produced.