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: 92

Answer

Empirical formula $C_5H_7N$ Molecular formula: $C_{10}H_{14}N_2$

Work Step by Step

Atomic weights (g/mol): $C: 12.011,\ H: 1.008,\ N: 14.007$ In 100.0 g: C: $74.0\ g \div 12.011 = 6.16\ mol$ H: $8.65\ g\div 1.008 = 8.58\ mol$ N: $17.35\ g\div14.007=1.24\ mol$ Normalizing by the smallest amount of moles: C: $6.16/1.24= 4.97$ H: $8.58/1.24= 6.92$ N: $1.24/1.24= 1.00$ Empirical formula $C_5H_7N$ Empirical formula's molar mass: $M_u=81.12\ g/mol$ $M/M_u=2.0$ Molecular formula: $C_{10}H_{14}N_2$
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