As shown in the figure below, you have a system including a Uranium vessel with mass M_vessel = 0.473 kg. The vessel contains water with mass M_water = 0.226 kg. Both the vessel and water are initially at a temperature of 30.3 degrees Celsius. You add steam into the system. The steam has an initial temperature of 122.5 degrees Celsius and a mass of M_steam = 0.0129 kg. The system will reach equilibrium with all the steam having condensed at some final temperature below 100 degrees Celsius.

Steam Calorimetry_SteamCondenses All of the steam condenses into water The system reaches equilibrium at T