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Work done in expansion of anideal gas fr...

Work done in expansion of anideal gas from 4 litre against a constant external preesure of 2.1 atm was used to heat up 1 mole of water at 293 K. If specific heat of water is `4.2` J `g^(-1) K^(-1)`, what is the final temperature of water (in K) ?

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