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A blimp is filled with 5000m^3 of helium at 20°C and 1.05 bar pressure.The volume of the cabin is 30m^3 and the mass of the empty blimp structure (no helium) is 4200kg. What is the maximum additional mass that can be loaded into the cabin and still permit lift off? The surrounding air is at 1.00 bar pressure and 20°C. The molar mass of air is 28.8gmol–1

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