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A 2-kg piece of iron is heated from room temperature 25°C to 400°C by a heat source at 600°C. What is the irreversibility in the process? 

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C.V. Iron out to 600°C source, which is a control mass.

A real flame may be more than 600°C, but a little away from it where the gas has mixed with some air it may be 600°C. 

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