1.

A gas occupies a volume of 250 ml at 700 mm Hg pressure and 25^(@)C . What additional pressure is required to reduces the gas volume to its 4//5 th value at the same temperature ?

Answer»

<P>225 mm Hg
175 mm Hg
150 mm Hg
265 mm Hg

Solution :`V_(2) = 250 ml` , `P_(1) `= 700mm Hg
`V_(2) = 250 xx ( 4)/( 5)`
`= 200 ml , P_(2) = ?`
According to Boyle.s LAW,
`P_(1) V_(1) = P_(2) V_(2)`
or `P_(2) = ( 250 xx 700)/( 200) = 875 mm Hg`
Additional pressure required
`= 875 - 700`
= 175 mm Hg


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