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The gas in the cylinder cannot be emptied to create vacuum. So, once the pressure inside the cylinder equals atmospheric pressure, it stops pushing gas to the balloon. Hence the last balloon may not be inflated to full. Considering this, the available pressure in the cylinder initially has to be initial cylinder pressure - atmospheric pressure which is 2.75 × 10^6 - 1.01 × 10^5 = 2.64 x 10^6 Pa.
therefore, (2.64 x 10^6) * (6 x 10^-3) = 1.1 x 10^5 x v2
v2= 0.144 m^3
therefore, v2/ volume of helium in 1 balloon
= 0.144/0.003 =48
(remember there are many ways of doing a sum)
