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20. (2 pts.) A 2.20-kg iron pot contains 3.00 kg of water, all initially at 25.6°C. A hot iron horseshoe with a mass of 519 grams is dropped into the water. After the pot, horseshoe, and water all reach thermal equilibrium, the final temperature of all three is 33.0*C. What was the initial temperature of the hot horseshoe, in degrees Celsius? (Laulima will contain a randomized value within the range shown.) Assume rapid heat transfer within the system, and that the system is fully insulated from its surroundings. Specific heat capacities: Chron = 450.J/(kg:K) Cwater = 4186 J/(kg:K) 21. (2 pts. How much total heat is required to transform liters of liquid water that is initially at 25.0°C entirely into H2O vapor at 100°C? Convert your final answer to megajoules. (Laulima will contain a randomized value within the range shown.) Assume rapid heat transfer within the system, and that the system is fully insulated from its surroundings. Physical values for H:0, although you may not need to use all of them. Cliquid water - 4186 J/(kg.K) L = 334,000 J/kg Lv = 2,256,000 J/kg 22. (2 pts.) How much total heat is needed to fully melt 14.6 kg of silver, if the silver starts as a 25.0'C solid? Convert your final answer to megajoules. (Laulima will contain a randomized value within the range shown.) Assume rapid heat transfer within the system, and that the system is fully insulated from its surroundings. Physical values for silver Tel961'C Csolid Ag - 230.J/kg K L=88.0 kJ/kg