Heat Capacity: Units, Mols & Avogadro's Constant

[jimmy42]

I have the equation for heat capacity for constant volume and pressure.

Cv = Cp -R

So for Cp I have the units J/k and for R the units are J/k mol. So my question is related to that mol. Is it right that I need to get rid of that mol? if so how? Does it involve Avogadro's Constant? Or do I have the wrong units for Cp?

Thanks.

 

[rock.freak667]

The units for c_p is kJ/kgK which can be rewritten as kJ/kmol*k. Although I know that R to be the gas constant and not the universal gas constant.

 

[jimmy42]

I have

Where Q is the energy as heat and dT is the change in temp in Kelvin.

Cp = Q/dT

Cp = 100J / 2K

Cp = 50 J/K

So, is that not right? R = molar gas constant.