A weather balloon is inflated with helium (He) gas to a volume of 1.71 L at an ambient temperature of 25.7 °C and pressure of 1.13 atm. Once the balloon has reached a higher altitude, its volume has changed to 2.25 L and the temperature is now 14.9 °C. What is the final pressure (in torr)?

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ChapterU3: Weather: Phase Changes And Behaviour Of Gases
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A weather balloon is inflated with helium (He) gas to a volume of 1.71 L at an ambient temperature of 25.7 °C and pressure of 1.13 atm. Once the balloon has reached a higher altitude, its volume has changed to 2.25 L and the temperature is now 14.9 °C. What is the final pressure (in torr)? 

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