Calculate percentage by mass of hex$\mathrm{on}$gono in a mixture containing$6\mathrm{.}22$ g of this compound and$18460$ octane.

$2-$ Calculate the molarity of NaCi$($mm $585$ g $/$mol in a solution solution$\mathrm{from}$n that was prepared by mixing$\mathrm{.}5612$g of salt with$100$ml of water$($density$=1\mathrm{.}00$g$/$mol$)$

$3-$Calculate percentage by volume of ethanol in a mixture containing$700$ mlno of this alcohol and$1\mathrm{.}050$ L of water