2. Balloons now are used to moved huge trees from their cutting place on mountain slope to conventional transportation. Calculate the volume of a balloon needed if it is desired to have a lifting force of 1000 kg when the temperature is 290 K at 0.940 atm. The balloon is to be filled with helium. Assume that air is 80% mol N₂ and 20% mol O₂. Ignore the mass of the superstructure and the propulsion engines of the balloon.

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