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For, underset(("excess"))(2A) + B+C rarr...

For, `underset(("excess"))(2A) + B+C rarr` Products, calculate the:
(a) rate expression.
(b) units of rate and rate constant.
( c) effect on rate if concentration of `A` is doubled and of `B` is tripled.

Text Solution

Verified by Experts

(a) Rate `=K[A]^(0)[B]^(1)[C]^(1)`
(b) Unit of rate = mol `litre^(-1) time^(-1)`
Unit of rate constant = `litre mol^(-1) time^(-1)`
(c ) Let initial conc. Of A, B and C be a, b and c, respectively.
`:. r_(1)=K(a)^(0)(b)^(1)(c )^(1) …(1)`
Now `[A]=2a,[B]=3b`
`:. r_(2)=K(2a)^(0)(3b)^(1) (c )^(1) ...(2)`
By eqs. (1) and (2), `r_(1)/r_(2)=1/3`
`:. r_(2)=3 r_(1)`
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