How to calculate initial pressure and temperature - adiabatic process

[JoeyBob]

Homework Statement

Ratio from specific heats = 5/3

Initial volume = 0.814, final volume = 0.37, final pressure = 276000, final temperature is 297.273 K

Find Work

Relevant Equations

PV=nRT

Im confused on working backwards so to speak to find adiabatic work.

To find work for this adiabatic process, I either need to know the change in temperature OR the initial pressure (I think?).

The issue is that I don't know either the initial temperature nor the initial pressure so I am not sure how to calculate the work using the adiabatic eqns that require these values.

I know the answer to this problem is -63000 J, just not sure how to get there.

 

[Herman Trivilino]

When you say adiabatic equations, what do mean?

 

[JoeyBob]

When you say adiabatic equations, what do mean?

http://hyperphysics.phy-astr.gsu.edu/hbase/thermo/adiab.html

 

[Chestermiller]

Are you familiar with the equation $$PV^{\gamma}=Constant$$

 

[Herman Trivilino]

The issue is that I don't know either the initial temperature nor the initial pressure so I am not sure how to calculate the work using the adiabatic eqns that require these values.

The adiabatic equations you pointed me to don't involve temperature. Can you find the value of $K$?

 

[guv]

Homework Statement:: Ratio from specific heats = 5/3

Initial volume = 0.814, final volume = 0.37, final pressure = 276000, final temperature is 297.273 K

Find Work
Relevant Equations:: PV=nRT

Im confused on working backwards so to speak to find adiabatic work.

To find work for this adiabatic process, I either need to know the change in temperature OR the initial pressure (I think?).

The issue is that I don't know either the initial temperature nor the initial pressure so I am not sure how to calculate the work using the adiabatic eqns that require these values.

I know the answer to this problem is -63000 J, just not sure how to get there.

Check very carefully what you are given at final state.

 

[JoeyBob]

Are you familiar with the equation $$PV^{\gamma}=Constant$$

So I use final volume and pressure for this? I treid that and it didnt give the right answer for me.

 

[Chestermiller]

So I use final volume and pressure for this? I treid that and it didnt give the right answer for me.

Show us what you did.