What is the change in entropy of 0.130 kg of helium gas at...

What is the change in entropy of 0.130 kg of helium gas at the normal boiling point of helium when it all condenses isothermally to 1.00 $L$ of liquid helium? ($Hint$: See Table 17.4 in Section 17.6.)

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Key Concepts

Phase Transition (Latent Heat)

A phase transition involves the conversion between different states of matter, such as gas to liquid, without a change in temperature when the process occurs at the phase equilibrium conditions. The latent heat associated with a phase transition is the energy required to change the state of a substance and is directly related to the change in entropy during the process.

Isothermal Process

An isothermal process occurs at constant temperature. During such a process, especially when a phase transition is involved, the entropy change of a system is calculated by dividing the heat exchanged (due to latent heat in phase transitions) by the constant temperature. This concept is crucial when analyzing phase changes like condensation or vaporization.

Entropy

Entropy is a thermodynamic state function that measures the disorder or randomness of a system. In any reversible process, the change in entropy is defined as the heat transferred divided by the temperature at which the transfer occurs. It provides insight into the efficiency of energy conversions and reflects the inherent dispersal of energy in a system.

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