Chemistry: A Molecular Approach (3rd Edition)

Published by Prentice Hall
ISBN 10: 0321809246
ISBN 13: 978-0-32180-924-7

Chapter 3 - Sections 3.1-3.12 - Exercises - Problems by Topic: 71b

Answer

79.89%

Work Step by Step

Calculate the total mass of carbon in the compound. The calculate the molar mass of the entire compound. Divide the total mass of carbon by the total molar mass of the compound. Then, multiply by 100% to determine the percent composition by mass. Molar Mass of $C$: $2(12.0107 g/mol) = 24.0214 g/mol$ Molar Mass of $C_{2}H_{6}$: $2(12.0107 g/mol) + 6(1.0079 g/mol) = 30.0688 g/mol.$ % $C = (24.02 g/mol\div30.07 g/mol)\times100$% =$79.89$%
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