Question

HI→H2 + I2 which order reaction?

Answer 1

This is a second order reaction.

Explanation:

For the reaction,

`"2HI" → "H"_2 + "I"_2`,

the experimentally determined rate law is

`"rate" = k"[HI]"^2`

The order of the reaction is the exponent in the rate law.

Thus, this is a second order reaction.