Chemistry and Chemical Reactivity (9th Edition)

Published by Cengage Learning
ISBN 10: 1133949649
ISBN 13: 978-1-13394-964-0

Chapter 2 Atoms, Molecules, and Ions - Study Questions: 90

Answer

Empirical formula $C_2S$ Molecular formula: $C_{16}S_8$

Work Step by Step

Atomic weights (g/mol): $C: 12.011,\ S: 32.06$ In 100.0 g: C: $42.83\ g \div 12.011 = 3.566\ mol$ S: $57.17\ g\div 32.06= 1.783\ mol$ Normalizing by the smallest amount of moles: S: $1.783/1.783 = 1.0$ C: $3.566/1.783= 2.0$ Empirical formula $C_2S$ Empirical formula's molar mass: $M_u=56.09\ g/mol$ $M/M_u=8.0$ Molecular formula: $C_{16}S_8$
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