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Solution: 9.00 moles of a monatomic ideal gas expands isobarically at ...

Question

9.00 moles of a monatomic ideal gas expands isobarically at 3.00 x 10  5 Pa from an initial volume of 0.300 m3 to a final volume of 0.400 m3. What is the change in the internal energy of the gas? In this process, does the internal energy of the gas increase or decrease?