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A helium-filled weather balloon has a volume of 743 L at 17.9°C and 754 mmHg. It...

A helium-filled weather balloon has a volume of 743 L at 17.9°C and 754 mmHg. It is released and rises to an altitude of 6.63 km, where the pressure is 393 mmHg and the temperature is –22.1°C.

The volume of the balloon at this altitude is  L.

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