Answer to Question #235284 in Molecular Physics | Thermodynamics for Jimmy

Question

Find the enthalpy of Helium if its internal energy is 200 KJ/kg

h = _____ kJ/kg

Answer 1

Gives

U=200KJ/kg

$U=mc_vT\\H=mc_pT$

Now

$\frac{H}{U}=\frac{mc_pT}{mc_vT}\\\frac{H}{U}=\frac{c_p}{c_v}$

Helium is monoatomic

$\frac{c_p}{c_v}=\frac{5}{3}$

$$H=\frac{c_v}{c_p}\times U=\frac{5}{3}\times200=333.33kJ/kg$$

$h=H=333.33kJ/kg$