Pure diethyl ether $(C_4{H}_{10}O)$ has a normal boiling point of $34\mathrm{.}60C.$ A solution of $26\mathrm{.}0g$ of cocaine $(C_{17}{H}_{21}N{O}_4)$ in $181g$ of diethyl ether has a boiling point of $35\mathrm{.}67C.$ Calcu $K_{bp}$ for diethyl ether based on this experiment.

$K_{bp}=,C{m}^{-1}$

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