The Universal gas constant is 8.314 J/(mol) K. Express this value in units of atm ft3/(lb-mol) °R.?

Question

hi everyone, question is:

The Universal gas constant is 8.314 J/(mol) K. Express this value in units of atm ft3/(lb-mol) °R.

Bit stuck on how i get to J to ft3. Thanks for any help.

Answer 1

I worked on this one yesterday and could not get any of the numbers to "work out"

The answer is:

0.7302413 ft^3·atm·°R^-1·lb-mol^-1

but that's from a table (lookup) -- not calculated.

ft^3·atm is in units of Pressure * volume.  So use in the gas equation works out (temperature cancels out (°R/°R) and so long as the amount is in lb-mol, those units cancel out.

I searched on "lb-mol" and found a couple of semi-informative articles and BB posts.  Maybe you can find some others.

http://web.utk.edu/~dad/mole.html

http://www.convert-me.com/en/bb/viewtopi...