A 1.5-dm3 sample of hydrogen gas is initially at 3.0 bar pressure and 25.0 °C, which can be regarded to be ideal. It is reversibly and adiabatically enlarged until the volume reaches 5.0 dm3. The heat capacity of H2 is 28.80 J K^–1 mol^–1 and is believed to be temperature independent. a. Calculate the gas's final pressure and temperature after it has expanded. b. Calculate the process's  ΔU and  ΔH.

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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.