At a certain temperature a $36\mathrm{.}85\%($v$/$v$)$ solution of ethyl alcohol, C$2$H$5$OH$,$ in water has a density of $0\mathrm{.}9085$ gmL$^-1.$ The density of ethyl alcohol st this temperature is $0\mathrm{.}7659$ gmL$^-1,$ and that of water is $0\mathrm{.}9917$ gmL$^-1.$

$.$

Calculate the molar concentration of ethyl alcohol.

$.$

Calculate the molal concentration of ethyl alcohol.

$.$

Calculate the mole fraction of ethyl alcohol in the solution.

$.$

If the vapor pressure of ethyl alcohol at this temperature is $41\mathrm{.}0$ torr and the solution is ideal, what is the pressure of ethyl alcohol above this solution?

$.$

If the vapor pressure of water at this temperature is $17\mathrm{.}5$ torr and the solution is ideal, what is the pressure of water above this solution?