What is the temperature of the gas?

[Bigworldjust]

Homework Statement

A gas of 8.00×10^19 atoms or molecules has 0.500 J of thermal energy. Its molar specific heat at constant pressure is 20.8 J/mol K.

Homework Equations

T = 0.5/(N*specific heat)

The Attempt at a Solution

I divided 8.00*10^19 by Avogadro's Constant to get the number of moles. Than I did .5/(N*20.8 J/mol K) and got 181 K. But that seems to be incorrect. Anyone know why?

 

[ehild]

Why does it seem incorrect?

Edit: The molar heat at constant pressure is given!

ehild

 

[vela]

You're using the wrong specific heat.

 

[Bigworldjust]

What specific heat do I use?

 

[ehild]

Use Cv.

ehild

 

[Bigworldjust]

Wait how do I calculate Cv?

 

[vela]

That's something you need to figure out. The relationship between c_p and c_v is surely talked about in your textbook.

 

[Bigworldjust]

Thanks, I got it now.