$5.$ In a membrane cell, $5\mathrm{.}85$ g of NaCl is electrolyzed. Calculate the volume of hydrogen gas produced at STP$.($Molecular weight of NaCl $=58\mathrm{.}44$ g$/$mol$,$ Molar volume of gas at STP $=22\mathrm{.}4$ L$/$mol$)$

$6.$ Calculate the mass of bleaching powder $($Ca$($OCl$))$ produced when $10$ moles of chlorine gas react with calcium hydroxide. $($Molecular weight of Ca$($OCl$)=142\mathrm{.}98$ g$/$mol$)$