Answer
The first one.
Work Step by Step
For the first food product:
$170 kcal\times 4.18 \frac{kJ}{kcal}=710.6 kJ$
Since the second food product provides 280 kJ per serving, the first one provides the greater energy per serving.
Chemistry and Chemical Reactivity (9th Edition)
by Kotz, John C.; Treichel, Paul M.; Townsend, John R.; Treichel, David A.
Published by
Cengage Learning
ISBN 10:
1133949649
ISBN 13:
978-1-13394-964-0
Let's Review: The Tools of Quantitative Chemistry - Study Questions - Page 43a: 19
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