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: 124

Answer

a) $C_{10}H_{15}NO$ $M=165.23\ g/mol$ b) $72.69\%$ c) $7.57\times10^{-4}\ mol$ d) $4.56\times10^{20}\ molecules$ $4.56\times10^{21}\ atoms\ of\ C$

Work Step by Step

Atomic weights (g/mol): $C: 12.011,\ H: 1.0079,\ O: 15.999,\ N: 14.007$ a) $C_{10}H_{15}ON$ $M=10\times12.011+15\times1.0079+15.999+14.007 = 165.23\ g/mol$ b) $10\times12.011/165.23\times100\%=72.69\%$ c) $0.125\ g \div 165.23\ g/mol = 7.57\times10^{-4}\ mol$ d) 0.125g: $7.57\times10^{-4}\ mol\times6.022\times10^{23}\ molecules/mol=4.56\times10^{20}\ molecules$ $4.56\times10^{20}\ molecules\times10\ atoms\ of\ C/molecule=4.56\times10^{21}\ atoms\ of\ C$
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