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:
$$\frac {56}{194.19}=28.8 \% $$
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
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