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

An ideal gas with V = 5x105 cm³, P = 150x103 Pa and T = 293K is contained in a piston-cylinder. The gas is isothermally compressed with a constant external pressure of 400x103 Pa. Assuming the surroundings is at 293K and the gas Cp = 25R: %3D %3D %3D a. Determine the heat transfer during the process b. What is the entropy change of the system, surroundings, and overall? C. Is the process reversible, irreversible, or impossible?

A curious blacksmith forge 1 kg of iron then dropped it to an insulated container that contains 50 liters of water. Before dropping the iron into the insulated container, the blacksmith measures the temperature of iron and water as 500 °C  and 20 °C, respectively. This curious blacksmith is always interested in thermodynamics and tries to calculate equilibrium temperature and the total entropy change because of his/her action.  What will be the equilibrium temperature and the total entropy change? Is this process reversible or irreversible? (Density and specific heat of water at 20 °C are 995.10 kg/m3  and 4.16 kJ/kg.C, respectively. Assume that the specific heat capacity of iron is 0.5 kJ/kg.C)