7. a 5kg copper bar initially at 300'c is placed on top of a 1 kg block of ice at -5°c at atmospheric pressure. assume no heat losses to the surroundings a. calculate the final temperature of the system after thermal equilibrium b. what initial temperature of the 5 kg copper bar is needed to raise the temperature of 1 kg block of ice from 5°c to 70°c? c. what mass of copper at 300'c must be placed to vaporize a 1-kg block of ice at -5°c to steam at 110°c? data for copper and water c. cu (s) - 0.385 j/g-k ahh.01 - 334 jg c. (h0 (s) - 2.06 j/g- k a hp. (h o1 - 2,261 j/g c. [h20 (1-4.18 j/gk c. [h0 - 2.02 j/gk