c) For the reaction, `H_(2)+I_(2)rarr 2HI`, the rate of disappearance of `H2` is `1xx10^(-4)Ms^(-1)`. What is the rate of appearance of `HI`.

Explanation

Rate expression for the reaction
`H_(2)+I_(2)rarr2HI` is
`-(Delta[H_(2)])/(Deltat)=-(Delta[I_(2)])/(Deltat)=(1)/(2)([HI])/(Deltat)"             …(1)"`
Given that
`-(Delta[H_(2)])/(Deltat)="Rate "=1xx10^(-4)MS^(-1)`
Substitute in the equation (1)
Rate of appearance will be equal to rate of disappearance
`-(Delta[H_(2)])/(Deltat)=(1)/(2)(Delta[HI])/(Deltat)`
`1xx10^(-4)=(1)/(2)(Delta[HI])/(Deltat)`
`2(1xx10^(-4))=(Delta[HI])/(Deltat)="Rate "=2xx10^(-4)ms^(-1)`
Rate of appearance of `HI` is `2xx10^(-4)ms^(-1)`