1. Steam at a temperature of 210°C has a specific entropy of 7.1167 kJ/kg-K. Determine the pressure, internal energy, enthalpy and specific volume. 2. A rigid vessel contains 5 kg of wet steam at 4.0 Mpa. After the addition of 9585 kJ the steam has a pressure of 2.0 MPa and a temperature of 700°C. Determine the initial internal energy and the specific volume of the steam. 3. There are 2.30 kg/min. of steam undergoing an isothermal process from 25.5 bar, 317 C to 6.3 bar. Determine (a) AS (b) W for nonflow, and (d) W for steady flow with P = 0, K =42kJ/min. (1 bar = 100 kPa)

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Entropy

In physics, entropy means the amount of disorder or the degree of randomness associated with a thermodynamic system. The system is not self-organized when the entropy of the system is high. For instance, when a system is at an elevated temperature, its molecules are in random motion, vibrating and colliding with each other. During this scenario, the probability of finding a molecule at a particular place twice, is low. Under this circumstance, the system can be said to be in a high entropy.