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d = m/v

m = molar mass = 46g

one mole of a gas (vapor) occupies 22.4 L at STP. You didn't mention pressure so I have to assume 1 atm (std pressure).

v/t = v/t

22.4 / 273 = V / 393 .... V = 22.4 x 393/273 = 32.25L

D = 46 / 32.25 = 1.43 g/L

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12y ago

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