an unknown gas shows a density is 3 g per litre at 273 degree celcius and 1140 mm Hg prssure. what is the gram molecular mass of this gas

an unknown gas shows a density is 3 g per litre at 273 degree celcius

1.	an unknown gas shows a density is 3 g per litre at 273 degree celcius and 1140 mm Hg prssure. what is the gram molecular mass of this gas
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