Find the entropy change when 75 g of steam condenses to water at 100^∘ C.

Name: Problem 56, Chapter 14: Essential College Physics
Uploaded: 2021-05-29T16:30:02-08:00
Duration: 1 min 15 s
Channel: Narayan Hari
Description: Find the entropy change when 75 g of steam condenses to water at 100^∘ C.

step 1 In this problem, given that mass of steam M is equal to 75 gram, which can be written as 75 mult

Find the entropy change when 75 g of steam condenses to...

Key Concepts

Reversible Process

Reversible processes are idealized transformations that occur infinitely slowly, allowing the system to remain in thermodynamic equilibrium at all times. This concept is crucial because it enables the precise calculation of thermodynamic quantities like entropy change using the relation dS = dq_rev/T. In real-world applications, while true reversibility is an approximation, it provides a useful model for understanding ideal energy exchanges.

Phase Transition

A phase transition is the transformation of a substance from one state of matter to another, such as from a gas to a liquid. This transformation typically occurs at a constant temperature and involves latent heat. Understanding phase transitions is important in thermodynamics because these processes involve significant energy changes and are often accompanied by changes in entropy.

Entropy

Entropy is a thermodynamic state function that quantifies the degree of disorder or randomness in a system. It is defined through changes in heat transfer during reversible processes, where the differential change in entropy is given by dS = dq_rev/T. This concept is central to understanding how energy disperses and is distributed among the molecules in a system during various processes.

Latent Heat

Latent heat refers to the amount of energy absorbed or released by a substance during a phase change, such as condensation or evaporation, without a change in temperature. In phase transitions, the energy change is utilized to overcome intermolecular forces rather than to increase kinetic energy, making latent heat a key factor in the calculation of entropy changes during processes that occur at constant temperature.

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