Hydrogen cyanide, HCN, is a poisonous gas. The lethal dose is
approximately 300 mg HCN per kilogram of air when inhaled.
(a) Calculate the amount of HCN that gives the lethal dose
in a small laboratory room measuring 3.5 * 4.5 * 2.5 m.
The density of air at 26 C is 0.00118 g>cm3.
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