Question

A block of tin with a mass of 1.90 kg, initially at a temperature of 150.0°C, is in a well-insulated container. Water at a temperature of 28.0°C is added to the container, and the entire interior of the container is allowed to come to thermal equilibrium, where it reaches a final temperature of 70.0°C. What mass of water (in kg) was added? Assume any water turned to steam subsequently recondenses. (I've tried 0.18, 0.1816, 0.1818, and 0.182 .. very unsure of where I'm going wrong)

Answer 1