SOLVE THE LAST PART PLEASE. THANK YOU.

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A storage tank for liquid $n-$octane has a diameter of $34\mathrm{.}0ft$ and a height of $25\mathrm{.}0ft.$ During a typical $24-h$ period the level of liquid

octane falls from $23\mathrm{.}0ft$ to $9\mathrm{.}00ft,$ after which fresh octane is pumped into the tank to return the level to $23\mathrm{.}0ft.$

As the level in the tank falls, nitrogen is fed into the free space to maintain the pressure at $18\mathrm{.}0$ psia; when the tank is being refilled, the

pressure is maintained at $18\mathrm{.}0$ psia by discharging gas from the vapor space to the environment.

The nitrogen in the tank may be considered saturated with octane vapor at all times. The average tank temperature is $80\mathrm{.}0F.$

Daily Usage

Correct

Pressure Variation

Correct

Environmental Loss

Now consider the amount that evaporates. How much octane is lost to the environment during a $24-$h period? lbm$/$day