A balloon filled with helium gas has a volume of 39 mL at a pressure of 101.3 kPa. The balloon is released and reaches an altitude where the pressure is 50.4 kPa.

Question

A balloon filled with helium gas has a volume of 39 mL at a pressure of 101.3 kPa. The balloon is released and reaches an altitude where the pressure is 50.4 kPa. If the temperature has remained the same, what volume does the gas occupy at that height?

Answer 1

At constant temperature we are dealing with Boyles Law:

P1V1 = P2V2

P1 = 101.3 kPa

V1 = 39 ml

P2 = 50.4 kPa

V2= ?

V2 = P1V1 / P2

plug in the values and solve for V2. Answer will be in mls.