A reaction vessel is charged with hydrogen iodide, which partially decomposes to molecular hydrogen and iodine: 2HI(g) <=> H2(g) + 12(g). When the system comes to equilibrium at 425 °C, PHL = 1.738 atm, and PH2 = Pı2 = 1.391 atm.
The value of Ke at this temperature is
Note: Ky works just like K and Keq. The units are in pressure instead of M. This may not be the actual Keq for this reaction.
Round your answer to 3 places past the decimal.