Chemistry: The Central Science (13th Edition)

by Brown, Theodore E.; LeMay, H. Eugene; Bursten, Bruce E.; Murphy, Catherine; Woodward, Patrick; Stoltzfus, Matthew E.

Published by Prentice Hall

ISBN 10: 0321910419

ISBN 13: 978-0-32191-041-7

Chapter 3 - Chemical Reactions and Reaction Stoichiometry - Exercises - Page 115: 3.37c

Answer

0.248 grams Caffeine

Work Step by Step

Caffeine C8H10N4O2 C is 12, 12*8 = 96 H is 1, 10*1 = 10 N is 14, 14*4 = 56 O is 16, 16*2 = 32 96 + 10 + 56 + 32 = 194 g/mol Since there are 6.022 x 10^23 molecules in 1 mole then 7.70 x 10^20 molecules * (1 mole/6.022 x 10^23 molecules) * (194 grams/1 mole) = 0.248 grams Caffeine

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