Sustainable Energy, Si Edition
Sustainable Energy, Si Edition
2nd Edition
ISBN: 9781337551670
Author: DUNLAP, Richard A.
Publisher: Cengage Learning
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Chapter 3, Problem 7P
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Calculate the amount of coal each person process, on average, per day.

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An average American consumes approximately 105 kJ of energy per day. The average life expectancy of an American is 77.9 years. How much coal would need to be burned to provide enough energy to meet a person's energy demands if the efficiency of energy production from coal is 38%? ☐g coal
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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.
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