Chemistry and Chemical Reactivity (9th Edition)

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

Chapter 13 Solutions and Their Behavior - Study Questions - Page 505b: 41


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Work Step by Step

Boiling point elevation: $80.26-80.10=0.16^{\circ}C$ Molality: $\Delta T_b=K_bm\rightarrow 0.16^{\circ}C=2.53^{\circ} C/m\times m\rightarrow m=0.063\ m$ Number of moles: $m=n/m_{solvent}\rightarrow n=0.063\ m\times (11.12/1000)\ kg=7.03\times10^{-4}\ mol$ Molar mass: $0.255\ g\div 7.03\times10^{-4}\ mol=362.61\ g/mol$ Molar mass of empirical formula: $184.02\ g/mol$ Molar mass ratio: $362.61\div 184.02=1.97\approx 2$ Molecular formula: $2\times empirical\ formula=C_{20}H_{16}Fe_2$
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