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 - Page 95e: 80


a) C: $57.82\%$ H: $6.07\%$ O: $19.26\%$ N: $16.86\%$ b) C: $76.86\%$ H: $12.90\%$ O: $10.24\%$ c) Co: $24.77\%$ Cl: $29.80\%$ H: $5.08\%$ O: $40.35\%$

Work Step by Step

Atomic weights (g/mol): $Co: 58.933,\ Cl:35.45,\ C: 12.011,\ H: 1.008,\ O: 15.999,\ N: 14.007$ Molar masses (g/mol): $C_8H_{10}N_2O_2: 166.18,\ C_{10}H_{20}O:156.26,\ CoCl_2\dot{}6\ H_2O: 237.93$ a) C: $8\times12.011/166.18\times100\%=57.82\%$ H: $10\times1.008/166.18\times100\%=6.07\%$ O: $2\times15.999/166.18\times100\%=19.26\%$ N: $2\times14.007/166.18\times100\%=16.86\%$ b) C: $10\times12.011/156.26\times100\%=76.86\%$ H: $20\times1.008/156.26\times100\%=12.90\%$ O: $15.999/156.26\times100\%=10.24\%$ c) Co: $58.933/237.93\times100\%=24.77\%$ Cl: $2\times35.45/237.93\times100\%=29.80\%$ H: $12\times1.008/237.93\times100\%=5.08\%$ O: $6\times15.999/237.93\times100\%=40.35\%$
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