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One gram vapour at at 100^(@)C is adde...

One gram vapour at at `100^(@)`C is added in a calorimeter which contains 20 g mixture (of water and ice in equilibrium) to just melt the ice completely .Then the mass of water present in the mixture before the process is (Given : `S_w` = 1cal `g^(-1)``C^(-1)`, `L_f` = 80 cal `g^(-1)` , `L_v` = 540cal `g^(-1)`

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