A 20 kg aluminum block initially at 500 C is brought into contact with a 20 kg block of iron at 100 C in an insulated enclosure. The final equilibrium temperature of the two blocks is 646.51 K. The specific heat of the aluminum block is 0.973 kJ/kgK. The specific heat of the iron block is 0.45 kJ/kgK. What is the total change in entropy of the two blocks during this process in units of kJ/K? Select the answer that is closest to the true value. A) 0.535 B) 0.987 C) 1.473 D) 1.966 O B OD

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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.