Study Questions

$1.$ Compare molarity and molality. When they can be equal to each other? Explain.

$2.$ A solution, containing $4\mathrm{.}50$ g of a nonelectrolyte dissolved in $1\mathrm{.}25$ g of water, freezes at $-$

$0\mathrm{.}372\backslash$deg C$.$ Calculate the molecular weight of the compound. $($Kf $=1\mathrm{.}86\backslash$deg C$/$m$)$

$3.$ Calculate the molality of a solution prepared adding $75$ g of MgCl$2$ to $750$ g water? $($MgCl$2$

$=95$ g$/$mole$,$ Kf $=1\mathrm{.}86\backslash$deg C$/$m$)$

$4.$ Arrange the following aqueous solutions in order of increasing freezing points.

$0\mathrm{.}1$ m glucose $0\mathrm{.}1$ m NaCl $0\mathrm{.}1$ m BaCl$20\mathrm{.}1$ m Na$3$PO$4$

$\_\_\_\_\_\_\_\_\_\_\_\_\_,\_\_\_\_\_\_\_\_\_\_\_\_\_,\_\_\_\_\_\_\_\_\_\_\_\_\_,\_\_\_\_\_\_\_\_\_\_\_\_\_$

$($lowest$)($highest$)$