Hi! I would like some help with this exercise. Please try to explain it thorough

Hi! I would like some help with this exercise. Please try to explain it thoroughly. Calculate the internal energy, the heath capacity and the entropy of gaseous Fe in the temperature range 25-2500 K and a pressure of 10^(−6) Pa. Make a plot of the occupation of the electronic states as a function of T, and estimate the temperature at which 1% of the Fe atoms are ionized at the given pressure.