State the order with respect to each reactant and overall order for the following reaction :
`H_2O_2+3I^(-)+2H^(+)rarr2H_2O+I_3^(-)(aq)`
Rate=`K[H_2 O_2][I^(-)]`
What are the units of rate constant?

Explanation

For the reaction
`H_2O_2+3l^(-)+2H^(+)rarr2H_2O+l^(-1)_3(aq)`
rate=`k[H_2O_2][I]`
`therefore` Ordr w.r.t I=1
Overall Order=1+1=2
To find units of k
`k=("Rate")/([H_2O_2][T])`
units of k= `("mol L"^(-1)s^(-1))/((mol L^(-1))(mol L^(-1)))`
`=mol^(-1)` L `s^(-1)`