I just want the answer for part C, and Please explain. To practice Problem-Solvi

Question

I just want the answer for part C, and Please explain.

To practice Problem-Solving Strategy 17.1: Work in Ideal-gas Processes.

A cylinder with initial volume V contains a sample of a gas at pressure p. On one end of the cylinder, a piston is let free to move so that the gas slowly expands in such a way that its pressure is directly proportional to its volume. After the gas reaches the volume 3V and pressure 3p, the piston is pushed in so that the gas is compressed isobarically to its original volume V. The gas is then cooled isochorically until it returns to the original volume and pressure.

Find the work W done on the gas during the entire process.

Part A

Which of the following pV diagrams correctly represents the entire process described in this problem?

SubmitMy AnswersGive Up

Correct

The entire process consists of three intermediate processes that take the gas from its initial state at pressure p and volume V and return it to the same state. As for any multistep processes that have the same initial and final state, the pV diagram is a closed curve. Be sure to clearly identify the direction and type of each step of the process. You may want to mark this information on your own pV diagram.

Solve

Part B

Find the amount of work W done on the gas during the entire process.

Express your answer in terms of some or all of the variables p and V.

2Vp

SubmitHintsMy AnswersGive UpReview Part

Correct

part C

Part C

To assess your calculations done in Part B, identify the net energy transfer taking place in each step of the process.

Sort each intermediate step of the process described in the problem introduction according to whether the net energy transfer is to the environment or to the gas.

I just want the answer for part C,

and Please explain how did you get it.

Thanks in advance

Explanation / Answer

In 1st step: Initial expansion, P is directly propertional to V. Initial P*V is less than final 3P*3V. So final temperature should be more vebause P*V/T is constant. So delta U = positive, Energy will be transferred to gas.

In Isobaric process since P is constant and V decreases, T will decrease and hence delta U will decrease. Energy will be transferred to environemnt.

In isochoric process since V is constant and P decreases, T will decrease and hence delta U will decrease. Energy will be transferred to environemnt.

Related Questions

Navigate

• Browse (All)
• Browse I
• Subjects