Find the volume of 297 g of phosgene (COCl₂). Phosgene was used in World War I as a chemical warfare agent.

n = m / M
n (COCl₂) = 297/99 = 3 mol.
V = n * Vm
V (COCI₂) = 3 mol * 22.4 L / mol = 67.2 L.

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