Two moles of an ideal gas undergo an irreversible isothermal expansion from Va=100 liters to Vb=300 liters at T=300K. (a) What is the entropy change for this process? (b)  What is the Gibbs free energy change? (c)  Is this process spontaneous or not? Explain your answer.

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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.