Chemistry: The Central Science (13th Edition)

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

Chapter 13 - Properties of Solutions - Exercises - Page 570: 13.67a



Work Step by Step

We are told we have equal masses of ethanol and H2O. Assuming we have 100g of ethanol and 100g of H2O we convert both to moles. The molar mass of H2O is 18g/mol and the molar mass of ethanol C2H5OH is 46g/mol. Converting both masses to moles we have For water: 100g * (1mol/18g) = 5.556 moles For ethanol 100g* (1mol/46g) = 2.17 moles Then, the mole fraction of ethanol would be: 2.17 / (2.17 + 5.556) = 0.281
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