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The vapour density of a gas is 40. Calcu...

The vapour density of a gas is 40. Calculate the volume of 20g of this gas at `27^(@)` and 950 mm pressure.

Text Solution

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Mol. Wt. of the gas`=2timesVD=2times40=80`
Thus, the volume of 80g of gas at STP is 22.4 lit
`therefore` the volume of 20g of gas at STP is `(22.4times20)/(80)=5.6lit.`
Let the volume of this 5.6 lit of gas at `27^(@)`C and 950 mm pressure be V lit
`therefore(Vtimes950)/(273+27)=(5.6times760)/(273) or, V=4.9` lit
Hence the volume of the gas at `27^(@)` and 600mm pressure is 4.6 litre.
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