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100ml of water at 20oCand 100ml of water at 40oC are mixed in calorimeter

100ml of water at 20oCand 100ml of water at 40oC are mixed in calorimeter until constant temperature reached.Now temperature of the mixture is 28oC . Water equivalent of calorimeter is 1)50J 2)104.5J 3)-24.2J 4)209J

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