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Your assumption about constant pressure can't actually exist while everything is closed. I am not using this assumption here because it is more correct and a bit easier: $$\pu{10 feet} = \pu{3.048 m}$$ $$(\pu{10 feet})^3 = \pu{28.3 m^3} = \pu{28300 L}$$ We can calculate the amount of substance using ideal gas equation: $$pV = nRT$$ $$n = \frac{pV}{RT} = \...

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