At a temperature of 273K and 1 atm press...

At a temperature of 273K and 1 atm pressure 1L of a gas weighs 2.054g. Calculate its molecular mass.

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22.4L of any gas at STP contains 1 mol off the gas .
1 L of a gas weighs 2.054g
`therefore` 22.4 L of the gas weighs `=2.054xx22.4g=46g`
`therefore` Molecular mass of the gas is 46.

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