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Fundamentals of thermodynamics

The work done to  contract a gas in a cylinder, is 462 joules. 128 joule energy is evolved in the process. What will be the internal energy change in the process


As the work is done on system, it will be positive i.e. W=+462 joule, q=128 joule  (heat is evolving) From the 1st law of thermodynamics 

            ΔE=q+w=(128)+(+462)=+334 Joules. 

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