A calorimeter of water equivalent 20 g...

A calorimeter of water equivalent 20 g contains 180 g of water at `25^(@)C` . 'm' grams of steam at `100^(@)C` is mixed in it till the temperature of the mixture is `31^(@)C` . The value of m is close to (Laten heat of water = 540 `cal g^(-1)` , specific heat of water = 1 cal `g^(-1) ""^(@)C^(-1))`

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