Chemistry (12th Edition)

Published by Prentice Hall
ISBN 10: 0132525763
ISBN 13: 978-0-13252-576-3

Chapter 10 - Chemical Quantities - 10.3 Percent Composition and Chemical Formulas - 10.3 Lesson Check - Page 333: 49


Emp: C5H10O2 Mol: C5H10O2

Work Step by Step

Each percentage represents the number of grams of an element per 100.0 grams of that compound. Convert these masses to moles using molar masses. Determine the number of moles of each element relative to the other elements. Divide all quantities by the smallest amount of moles. Eliminate fractional coefficients by multiplying all coefficients by 2. Compute the molar mass of the empirical formula. A molecular formula is always a whole number multiple of the empirical formula. Divide the molecular molar mass by the empirical molar mass to get this whole number.
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