A balloon ?lled with helium gas has a volume of 434 ml at a, Ask an Expert

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A balloon ?lled with helium gas has a volume of 434 mL at a pressure of 1 atm. The balloon is released and reaches an altitude of 6.5 km, where the pressure is 0.5 atm. Assuming that the temperature has remained the same, what volume does the gas occupy at this height?Answer in units of mL

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