A 5.6-liter bаllооn is filled with 0.25 mоles of helium gаs аt 1.0 atm and 0.0°C. The balloon is placed in a device that pressurizes the balloon to 2.5 atm and heats it to a final temperature of 100°C. The final volume of the balloon is 2.0 L. What is the final number of moles in the balloon based on these observations?