Intermediate Thermodynamics Questions & Answers  




You can only use the two expressions you are mentioning when the gas is calorically perfect and thermally perfect... Unfortunately, when using the Van der Waal equation of state, the gas is not thermally perfect and the latter can not be used.. You need to find another way to solve the problem. I'll give you 1 point bonus boost for this question.




Yes you are correct. The 9% error comes from the fact that we assumed $\bar{q}\approx\sqrt{\overline{q^2}}$. Very good observation. But for completeness you should explain what the definition of $f(v_x)$ is.




Great, this makes your previous post clearer!




Parts per million of species X means number of molecules/atoms of species X per millions of molecules/atoms in the mixture.



$\pi$ 