(Answered) A helium balloon occupies 85 l at 20 c and 10-atm pressure

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A helium balloon occupies 8.5 L at 20 °C and 1.0-atm pressure. The balloon rises to an altitude where the air pressure is 0.64 atm and the temperature is -10 °C. What is its volume when it reaches equilibrium at the new altitude? Note: Neglect tension forces in the material of the balloon. Express your answer using two significant figures.

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