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Work done in expansion of an ideal gas f...

Work done in expansion of an ideal gas from 4 litre to 6 litre against a constant external pressure of 2.5 atm was used to heat up 1 mole of water at 293 K. If specific heat of water is 4.184 J `g^(-1) K^(-1)` what is the final tempeature of water ?

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