Dry saturated steam at p1 = 3.5 MPa is contained in a cylinder-piston arrangement. It is brought into thermal contact with a heat sink at TR = 175oC. The steam rejects Q12 = 16 MJ of heat during a constant pressure process. The mass of steam is m = 10 kg. Determine (a) final state ‘2’ of steam, (b) change in entropy of steam (∆S12), and (c) change in entropy of the universe (∆SU ).

Determine the change in entropy of an ideal gas with constant heat capacity, CP=3.5R between the following States: P1= 1 bar, T1= 300k; V2= 0.025m³/mol;T2= 500k

Describe the equilibrium condition in terms of the entropy changes of a system and its surroundings. What does this de-scription mean about the entropy change of the universe?

A 40-lb aluminum bar, initially at Ta = 150oF, is placed in a tank together with 190 lb of liquid water, initially at Tw = 70oF, and allowed to achieve thermal equilibrium. The aluminum bar and water can be modeled as incompressible with specific heats ca = 0.216 Btu/lb·oR and cw = 0.998 Btu/lb·oR, respectively. Consider the aluminum bar and water as the system and ignore heat transfer between the system and its surroundings. Determine the final temperature Tf, in oF, and the amount of entropy produced within the tank, in Btu/oR.