The rate of the reaction`H_2 +I_2 ⇌ 2HI` is given by:
Rate = 1.7 × 10-19 [H2] [I2] at 25°C.
The rate of decomposition of gaseous HI to H2 and I2 is given by:
Rate = 2.4 × 10-21 [HI]2 at 25°C.
Calculate the equilibrium constant for the formation of HI from H2 and I2 at 25°C.