Final answer:
Random systems require less energy than ordered systems since high entropy, indicative of disorder, is associated with lower energy levels.
Step-by-step explanation:
Random systems require less energy than ordered systems. This concept is encapsulated in the Second Law of Thermodynamics, which states that the more energy a system loses to its surroundings, the less ordered and more random it becomes. The measure of randomness or disorder within a system is known as entropy. High entropy signifies a high level of disorder and, consequently, a lower level of energy. Hence, as a system gains entropy, such as when molecules from a high concentration diffuse and spread out, it becomes increasingly disordered and requires less energy to maintain that state compared to maintaining order.