A 100 gram piece of ice is placed in an insulated calorimeter of negligible heat capacity containing 100 grams of water at 373K.
a. What is the final temperature of the water once thermal equilibrium is established?
b. Find the entropy change of the universe for this process.

Assume that a person skiing high in the mountains at an altitude of h = 15100 ft takes in the same volume of air with each breath as she does while walking at sea level. determine the ratio of the mass of oxygen inhaled for each breath at this high altitude compared to that at sea level. assume that the air composition (i.e. % of air that is oxygen) is the same at sea level as it is at 15100 ft.