When filling a weather balloon with gas, it is important to remember that the gas will expand greatly as it rises, which causes a pressure decrease. If a balloon that can inflate to hold 5000.0L is filled with 15.0 moles of helium gas. Initially, the balloon is not full because of the high pressure on the ground. What is the pressure, in ka, when the balloon rises to a point where the temperature is -10.0°C and the balloon has completely expanded