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 505e: 90


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Work Step by Step

Osmotic pressure: $\Pi=cRT\rightarrow c=(539/760)atm\div(0.082\ atm.L/mol.K\times 298\ K)=0.029\ mol/L$ Total number of moles of solutes: $0.029\ mol/L\times 0.1\ L=0.0029\ mol$ $x\ g/369.41\ g/mol+(1.00-x)\ g/342.30\ g/mol=0.0029\ mol\rightarrow x= 0.089\ g$ Heroin weight percent $0.089/1.00\times100\%=8.9\%$ Lactose weight percent: $100-8.9=91.1\%$
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