1.

Hypothetical reaction A_(2)+B_(2) to 2AB, follows the mechanism as given below: A_(2)hArrA+A (fast reaction) A+B_(2) toAB+B (slow reaction) A+B to AB (fast reaction) Give the rate law and oder of reaction

Answer»

SOLUTION :Slowest step is rate determining
Rate `=k[A][B_(2)]`…….`(1)`
Here `[A]` should be determined as
`K_(c )=([A][A])/([A_(2)])=([A]^(2))/([A]_(2))`
`[A]=K_(c )^(1//2)[A_(2)]^((1)/(2))`
From EQ. `(1)`, Rate `=k.K_(c )^(1//2)[A_(2)]^((1)/(2))[B_(2)]`
`=K[A_(2)]^((1)/(2))[B_(2)]` `[K=k.K_(c )^(1//2)]`
Order `=1+(1)/(2)=(3)/(2)`


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