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[100ml" of water at "20^(@)C" and "100ml" of water at "40^(0)C" are mixed in calorimeter until constant temperature "],[" reached.Now temperature of the mixture is "28^(0)C" .Water equivalent of calorimeter is "],[[" 1) "50J,2" ) "104.5J,3)-24.2J," 4) "209J]]

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