When adjusted for any changes in ΔH and ΔS with temperature, the standard free energy change ΔG∘T at 500 K is equal to 9.8×104J/mol . Calculate the equilibrium constant at 500 K . Express your answer numerically to three significant figures.

The content of manganese (mn) in steel was determined spectrophotometrically and with the use of the standard addition method. an unknown sample of mn from a digested steel sample gave an absorbance of 0.185 when analyzed spectrophotometrically. when 5.00 ml of solution containing 95.5 ppm mn was added to 50.0 ml of the unknown steel solution (digested sample), the absorbance was 0.248. calculate the concentration, in parts-per-million (ppm), of mn in the digested steel sample solution.