Let us determine the ratio of amount of helium in the tank and the balloon. We may write the equation of the ideal gas
for the tank
P0V0=ν0RT
and for the balloon
P1V1=ν1RT
So
ν1ν0=P1V1P0V0=1.20⋅105⋅0.002102.30⋅107⋅0.00360≈328.6.
This amount is quite large, but it is not surprising, because the pressure in a tank is more than 100 times larger than the pressure in a balloon.
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