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A hydrogen cyanide concentration of 150ppm (by volume) is sufficient to kill a human being in a matter of minutes. Assuming that you have to do an experiment using 150 mg of NaCN and that, if something goes wrong, all of the cyanide could end up in the air of the lab, calculate the minimum size of the lab to keep the concentration of hydrogen cyanide in the lab below 5% of the lethal dose.

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