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 - 13-4 Colligative Properties - Review & Check for Section 13-4 - Page 497: 4



Work Step by Step

From the definition of freezing point depression: $\Delta T_{fp}=K_{fp}m$ $-0.762^{\circ}C=-1.86^{\circ}C/m\times m_s$ $m_s=0.41\ molal$ $m_s=(2.50\ g\div M_s)/0.05\ kg$ $M_s=121.95\ g/mol$
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