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A balloon is filled at 27^(@)C and 1 atm...

A balloon is filled at `27^(@)C` and 1 atm pressure by `500m^(3)` He. Then find the volume of He at `-3^(@)C` and 0.5 mm Hg pressure.

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`(P_(2)V_(2))/(T_(2))=(P_(1)V_(1))/(T_(1))`
`V_(2)=(P_(1)V_(1)T_(2))/(P_(2)T_(1))(1xx500xx(273-3))/(0.5xx(273+27))=(500xx270)/(0.5xx300)rArr V_(2)=900m^(3)`
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