What is the Formula for Calculating Entropy Change in a Phase Transition?

  • Thread starter Nicco de Vera
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In summary, entropy is a measure of disorder or randomness in a system, and is related to the second law of thermodynamics which states that entropy always increases over time. Entropy cannot be reversed, and is typically calculated using the formula S = k ln W, where S is entropy, k is the Boltzmann constant, and W is the number of microstates available to the system. Some real-world examples of entropy include melting ice cubes, mixing hot and cold water, and the rusting of metal.
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Nicco de Vera
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Homework Statement


Compute the entropy change of 5.00 g of water at 100°C as it changes to steam at 100°C under standard pressure.

Homework Equations

The Attempt at a Solution


5/100+100 is what i did and my teacher says its wrong 'cause its in the formula
 
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  • #2
Nicco de Vera said:
wrong 'cause its in the formula
In what formula?
 
  • #3
it is said that the formula was change in S= Change in Q / T
 
  • #4
It said absolute temperature; what is the absolute temperature? Further, "Q" is not mass.
 

1. What is entropy?

Entropy is a measure of disorder or randomness in a system. It is a thermodynamic property that quantifies the level of energy that is unavailable for work in a particular process.

2. How does entropy relate to the second law of thermodynamics?

The second law of thermodynamics states that the total entropy of a closed system will always increase over time. This means that the disorder or randomness within a system will tend to increase over time, and energy will naturally flow from areas of higher concentration to areas of lower concentration.

3. Can entropy be reversed?

No, according to the second law of thermodynamics, the total entropy of a closed system will always increase. This means that while local decreases in entropy are possible, the overall trend will always be towards an increase in entropy.

4. How is entropy calculated?

The exact calculation of entropy varies depending on the system, but it is typically calculated using the formula S = k ln W, where S is entropy, k is the Boltzmann constant, and W is the number of microstates available to the system at a given energy level. In simpler terms, entropy is a measure of the number of ways a system can be arranged or organized.

5. What are some real-world examples of entropy?

Some common examples of entropy include melting ice cubes, mixing hot and cold water, and the rusting of metal. In each of these cases, energy is being dispersed and the level of disorder or randomness is increasing, demonstrating the second law of thermodynamics in action.

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