# Chem

A sealed balloon is filled with 1.00 L of helium at 23°C and 1.00 atm. The balloon rises to a point in the atmosphere where the pressure is 299 torr and the temperature is -31°C. What is the change in the volume of the balloon as it ascends from 1.00 atm to a pressure of 299 torr?

AV = ?

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1. (p1v1/t1) = (p2v2/t2)
You have p1v1 and t1 on the ground and you have v2 and t2 in the upper atmosphere. The only unknown is the volume at it's height of ascent. Find v2, then the difference in volume is v2-v1 = ?
Watch that you keep the units the same (either all torr or all atm) and remember to change degrees C to kelvin.

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