100ml of water at 20^@C and 100ml of water at 40^@C are mixed in calorimeter until constant temperature reached. Now temperature of the mixture is 28^@C. Water equivalent of calorimeter is

100ml of water at 20^@C and 100ml of water at 40^@C are mixed in calor

1.	100ml of water at 20^@C and 100ml of water at 40^@C are mixed in calorimeter until constant temperature reached. Now temperature of the mixture is 28^@C. Water equivalent of calorimeter is
Answer» 50J 104.5J ` -24.2J` 209J Answer :D