1.

A flask containing air ( open to atmosphere ) is heated from 300K to 500K . The fraction of air escaped to the atmosphere is about.

Answer»

0.166
0.4
0.66
0.33

Solution :Suppose V is the volume of the flask
`( V_(1))/( T_(1))= ( V_(2))/( T_(2)) `
or `V_(2) = V_(1) xx ( T_(2))/( T_(1)) = V xx( 500)/( 300) = ( 5)/( 3) V `
Increase in volume `= ( 5)/( 3) V - V = ( 2)/( 3) V `
% of AIR escaped `= ( 2)/( 3) V xx ( 100)/( V) = 66.7%`


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