a. Identify the internal energy when a system releases 75 J of heat energy and does 54 J of work on its surroundings?
b. A 275-g sample of nickel at 100 o C is placed in 100 mL of water at 22o C. Determine the final temperature of the water? Assume that no heat is lost to or gained from the surroundings and the exact heat capacity of nickel 0.444J/(g.K).
c. Determine the number of calories are in 756.5 kJ(1 cal = 4.184 J)?