A tube leads from a 0.I50-kg calorimeter to a flask in which water is boiling under atmospheric pressure. The calorimeter has specific heat capacity 420 J/kg .K, and it originally contains 0.340 kg of water at 15.0oC Steam is allowed to condense in the calorimeter at atmospheric pressure until the temperature of the calorimeter and contents reaches 71.0oC, at which point the total mass of the calorimeter and its comments is found to be 0.525 kg. Compute the heat of vaporization of water from these data.