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Question

Payload is defined as the difference between the mass of displaced air and the mass of the balloon. Calculate the payload, when a balloon of radius 10 m of mass 100 kg is filled with helium at 1.66 bar at 27 C. (Density of air = 1.2 kg m3 and R = 0.083 bar dm 3 K1 mol1)

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Solution

The volume of the balloon is V=43πr3.
The radius of balloon is 10 m.
Hence, the volume of the balloon is V=43×3.1416×(10)3=4186.7m3.
The mass of displaced air is obtained from the product of volume and density. It is 4186.7×1.2=5024.04kg.

The number of moles of gas present are n=PVRT =1.666×4186.7×1030.083×300=279.11×103.

Note: Here, the unit of volume is changed from m3 to dm3.
1m3=1000dm3.

Mass of helium present is obtained by multiplying the number of moles with molar mass. It is 279.11×103×4=1116.44×103g=1116.4 kg.
The mass of filled balloon is the sum of the mass of the empty ballon and the mass of He. It is 100+1116.4=1216.4 kg.
Pay load = mass of displaced air mass of balloon =5024.041216.44=3807.6 kg

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