Chem question

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HCN gas is fatal at concentrations of 1 part per 500 by volume and is very dangerous within one hour at a concentration of 1 part per 10,000 by volume. What weight of NaCN is needed to fill a classroom that is 20.0 feet X 15.0 feet X 9.00 feet with HCN at a concentration of 1 part per 10,000 if the HCN is made by the following reaction?
2 NaCN + H2SO4 → Na2SO4 + 2 HCN

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