Chemistry: The Central Science (13th Edition)

Published by Prentice Hall
ISBN 10: 0321910419
ISBN 13: 978-0-32191-041-7

Chapter 4 - Reactions in Aqueous Solution - Exercises: 4.65

Answer

0.0174 M

Work Step by Step

BAC is grams alcohol/100mL of blood. To get to molarity, first we need to express it in terms of grams/L as follows: 0.08 grams/100mL * (1000mL/1L) = 0.8 grams/L Then we convert to moles using the molar mass of alcohol, which we need to find: CH3CH2OH Carbon has a mass of 12 Hydrogen has a mass of 1, 1*3 = 3 Carbon has a mass of 12 Hydrogen has a mass of 1, 1*2 = 2 Oxygen is 16 H is 1 12+3 + 12 + 2 + 16 + 1 = 46 g/mol Then we have: 0.8grams/L * (1mol/46grams) = 0.0174M
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