Chemistry: The Molecular Science (5th Edition)

by Moore, John W.; Stanitski, Conrad L.

Published by Cengage Learning

ISBN 10: 1285199049

ISBN 13: 978-1-28519-904-7

Chapter 2 - Chemical Compounds - Questions for Review and Thought - General Questions - Page 90e: 111a

Answer

28.8%

Work Step by Step

We know that the molar mass of caffeine is 194.19 g/mol. There are 4 nitrogen atoms with a total molar mass of 14*4=56 g/mol, so we find: $$\frac {56}{194.19}=28.8 \% $$

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