4. Three pounds of a perfect gas with R = 38 ft.lby/lb.R and k = 1.667 have 300 Btu of heat added during a reversible nonflow constant pressure change of state. The initial temperature is 100°F. Determine the (a) final temperature, (b) AH, (c) W, (d) AU, and (e) AS. Ans. (a) 919°F; (c) 120 Btu; (d) 180 Btu; (e) 0.3301 Btu/ºR

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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.