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A balloon contains 65m3 of helium at 100kPa and 22C. The balloon is connected by a valve to a large helium tank at 150kPa and

A balloon contains 65m3 of helium at 100kPa and 22C. The balloon is connected by a valve to a large helium tank at 150kPa and 25C. We open the valve and the helium enters the balloon until it reaches equilibrium with the tank. The balloon is made of a material that allows the volume to increase linearly with pressure. Neglecting heat transfer, find the final temperature of the balloon.

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