A sealed balloon is filled with 1.00 L helium at 23C and 1.00 atm. The balloon rises to a point in the atmosphere where the pressure is 240. torr and...

A sealed balloon is filled with 1.00 L helium at 23°C and 1.00 atm. The balloon rises to a point in the atmosphere where the pressure is 240. torr and the temperature is −34°C. What is the change in volume of the balloon as it ascends from 1.00 atm to a pressure of 240. torr?