$18$a$.$ Corrosion of pipes in boilers by oxygen can be alleviated through the use of sodium sulfite. Sodium sulfite removes oxygen from boiler feed water by the following reaction:

$2N{a}_{2}S{O}_3+O_{2}2N{a}_{2}S{O}_4$

How many pounds of sodium sulfite are required $($for complete reaction$)$ to remove the oxygen from $1\mathrm{.}0$ million gallons of water containing $10\mathrm{.}0$ parts per million of dissolved oxygen and at the same time maintain a $35\%$ excess of sodium sulfite?

$($a$)332lbs.$

$($b$)886lbs.$

$($c$)3057lbs.$

$($d$)2126lbs.$

$($e$)$ none of these