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A very flexible helium-filled balloon is released from the ground into the air at 20 degrees C. The initial volume of the balloon is 5.00 L, and the pressure is 760. mmHg. The balloon ascends to an altitude of 20 km, where the pressure is 76.0 mmHg and the temperature is -50. degrees C. What is the new volume, V2, of the balloon in liters, assuming it doesn't break or leak? Express your answer numerically in liters.