Gas from a bottle of compressed helium is used to inflate an inelastic flexibal balloon,originally

Gas from a bottle of compressed helium is used to inflate an inelastic flexibal balloon,originally folded completely flat to volume of 0.5 m^3 . if the barometer reads 760 mm Hg , what is the amount of work done upon the atmosphere by the balloon? sketch the system before and after the process. solution of pk nagg of solved example 3.1 #yogimechanics