Q$13.$ When $0\mathrm{.}534g$ of a nonelectrolyte solute is dissolved in

$15g$ of water and the freezing point of water is reduced

from $0C$ to $-1\mathrm{.}57C.$ The freezing$-$point depression

constant for water is $1\mathrm{.}85Ck\frac{g}{m}ol.$ What is the molar

mass of the solute in this solution?Q$23.$ a$)$ What is the standard free$-$energy change $,$ in $\{$:$kJ)$ for the

following reaction at $25C?$

$2KCi{O}_3(s)longrightarrow2KCl(s)+3O_2(g)$

b$)$ Is the reaction spontaneous of nonspontaneous?

A$.-346,$ spontaneous

B$.-1672,$ nonspontaneous

C$.-438,$ spontaneous

D$.-438,$ nonspontaneous

E$.-1672,$ spontaneous