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For a balloon ride, the balloon must be inflated with helium to a volume of 1500 m³ at sea level. The balloon will rise to an altitude of about 12 km, where the temperature is about -52^oC and the pressure is about 20 kPa. Assume the initial gas temperature and pressure to be 295 K and 1 atm.

How much helium should be put into the balloon?

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