A gas has a density of $2.857\mathrm{g}{\mathrm{L}}^{-1}$ at STP (molar volume $22.4\mathrm{L}\mathrm{mo}{\mathrm{l}}^{-1}$). Which gas is it? (C = 12, N = 14, O = 16, S = 32, Cl = 35.5)

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