$($a$)8\mathrm{.}43g$ of NaCl dissolved in $69\mathrm{.}2g$ of $H_{2}O$

$($b$)4\mathrm{.}69g$ of LiBr dissolved in $48\mathrm{.}9g$ of $H_{2}O$

$($c$)33\mathrm{.}8g$ of $KN{O}_3$ dissolved in $100g$ of $H_{2}O$

$($d$)2\mathrm{.}2{10}^{-3}g$ of NaOH dissolved in $1\mathrm{.}5g$ of $H_{2}O\%$