## Chemistry and Chemical Reactivity (9th Edition)

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