For the change of standard state $\frac{1}{2}{O}_{2(g)}=[O{]}_{(1,1wt\%inFe)}$

$G^0=-111,000-5\mathrm{.}87T(\frac{J}{m}ol).$

Calculate the value of Henry's law constant of $O$ in liquid $Fe$ at $1,800C.$ If an iron melt is at equilibrium in an atmosphere with an oxygen pressure of $5\mathrm{.}08{10}^{-13}$atm, what is the oxygen content in the melt? The atomic weight of $Fe$ and $O$ are $55\mathrm{.}8$ and $16\mathrm{.}0$ respectively.