A 5.6-liter balloon is filled with 0.25 moles of helium gas…

A 5.6-liter balloon is filled with 0.25 moles of helium gas at 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?