Environmental Science: Earth as a Living Planet (9th Edition)

Published by Wiley
ISBN 10: 1118427327
ISBN 13: 978-1-11842-732-3

Chapter 6 - Ecosystems: Concepts and Fundamentals - Critical Thinking Issue - Page 127: 3


333,000,000 kcal

Work Step by Step

1. Note that 21kJ/g of energy is equal to 5kcal/g. 2. Obtain the dry mass of wheat by subtracting the amount of water present from the original mass 333,000kg x 0.8 = 266,400kg water dried wheat = 333,000kg - 266,400kg = 66,600kg 3. Calculate the energy content using the relationship indicated in step 1. 66,600kg x $\frac{1000g}{1kg}$ x $\frac{5kcal}{g dried wheat}$ = 333,000,000 kcal
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