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After a free expansion to increase its volume by a factor of eight, a mole of...

After a free expansion to increase its volume by a factor of eight, a mole of ideal diatomic gas is compressed back to its original volume isobarically and then warmed up isochorically to its original temperature. What is the heat added to the gas in the final step to restoring its original state? (Use the following as necessary: p0 for the initial pressure and V0 for the initial volume.)

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