A 10L cylinder has helium at 8 atm and `32^@C`. How many balloons of 2L each at 2atm and `32^@C` can be filled with the gas available from the cylinder.

Explanation

The PV of balloon `= 2 xx 2 = 4` lit-atm
Gas from the cylinder it available to fill in the 1 balloons, until its pressure drops from 8 atm to 2atm.
The PV of helium available `= 10 xx (8-2) = 60 `lit-atm Number of balloons filled `=("PV of the gas aviailable ")/("PV of the balloon")= (60)/(4) = 15`