Given: The rate of the elementary reaction $H_2(g) + I_2(g) \rightleftharpoons 2HI(g)$ at $25^\circ C$ is given by: Rate = $1.7 \times 10^{-18} [H_2] [I_2]$ . The rate of decomposition of gaseous HI to $H_2(g)$ and $I_2(g)$ at $25^\circ C$ is Rate = $2.4 \times 10^{-21} [HI]^2$.
(a) 708
(b) 354
(c) 0.0014
(d) 26.6