Introductory Chemistry (5th Edition)

Published by Pearson
ISBN 10: 032191029X
ISBN 13: 978-0-32191-029-5

Chapter 3 - Matter and Energy - Exercises - Problems: 53

Answer

a) 9 * 10^7 joules b) 0.249 Cal c) 1.31 * 10^-4 kWh d) 1.1 * 10^4 cal

Work Step by Step

1 kWh = 3.6 X 10^6 joules; 1 cal = 1.162 X 10^-6 kWh; 1 kJ = 239 cal; 1 cal = 10^-2 Cal We use unit conversions to obtain: a) 25 kWh = 25 * 3.6 * 10^6 joules = 9 * 10^7 joules b) 249 cal = 0.249 Cal c) 113 cal = 113 * 1.162 * 10^-6 kilowatt-hour = 1.31 * 10^-4 kWh d) 44 kJ = 44 * 239 calories = 1.1 * 10^4 cal
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