Entropy problem -- heating 2 moles of an ideal gas....

In summary, the conversation was about calculating the change in entropy for 2 moles of an ideal gas when heated from 100L at 50C to 150L at 150C, with a specific heat capacity of 7.88 cal/moleC. The moderator reminded the person asking for help to show effort and understand the concept of entropy before asking for assistance.
  • #1
zerorin
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Moderator's Note: THIS HOMEWORK WAS POSTED IN ANOTHER FORUM, SO THERE IS NO TEMPLATE.

calculate the change in entropy suffered by 2 moles of an ideal gas on being heated from a volume of 100L at 50C to a volume of 150L at 150C. for the gas Cv=7.88 cal/moleC.

I'm really confused in entropy and don't know where to start..
 
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  • #2
The change in entropy for a reversible process is

DS = int (dQrev/T)

You should be able to calculate this if you know the equation of state for a perfect gas
 
  • #3
zerorin said:
calculate the change in entropy suffered by 2 moles of an ideal gas on being heated from a volume of 100L at 50C to a volume of 150L at 150C. for the gas Cv=7.88 cal/moleC.

I'm really confused in entropy and don't know where to start..
You have shown no effort to solve this problem. We need to see some effort on your part, even if it is something as little as articulating what entropy is and how it is calculated. How can we help you if we don't know what your sticking point is? Please do not post homework problems with no effort in the future.
 

1. What is the entropy problem?

The entropy problem refers to the apparent contradiction between the second law of thermodynamics, which states that entropy (a measure of disorder) always increases in an isolated system, and the reversible nature of many physical processes.

2. How does heating 2 moles of an ideal gas relate to entropy?

Heating a gas increases its internal energy, which leads to an increase in the number of microstates (possible arrangements of particles) and therefore an increase in entropy. This is in line with the second law of thermodynamics.

3. What is an ideal gas?

An ideal gas is a theoretical gas composed of particles that have negligible volume and do not interact with each other. This simplifies the equations used to describe the behavior of gases and is often used as a model for real gases at low pressures and high temperatures.

4. Why is the entropy problem important in thermodynamics?

The entropy problem highlights the limitations of the second law of thermodynamics and the complexities of understanding and predicting the behavior of physical systems. It has led to further research and development in the field of thermodynamics.

5. Is the entropy problem still a topic of debate among scientists?

Yes, the entropy problem is still a topic of discussion and research among scientists, particularly in the context of quantum mechanics and statistical mechanics. Some propose alternative theories to explain the reversible nature of some processes, while others continue to study and refine our understanding of entropy and the second law of thermodynamics.

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