Question

Rate of a reaction can be expressed by following rate expression Rate = k[A]² [B], if concentration of A is increased by 3 times, and concentration of B is increased by 2 times, how many times rate of reaction increases?
(a) 9 times
(b) 27 times
(c) 18 times
(d) 8 times

Answer 1

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Rate of a reaction can be expressed by following rate expression Rate = k[A]² [B], if concentration of A is increased by 3 times, and concentration of B is increased by 2 times, how many times rate of reaction increases?

→ [B]


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Answer 2

Answer:

Rate of reaction increases by 18 times.

Explanation:

• Let the rate of reaction be R.
• R = [A]²[B]. This means rate of reaction is directly proportional to square of A and and directly proportional to B.
• When we increased conc. of A 3 times and B 2 times rate will become

                           R' = [3A]²[2B]

                            R' = 9A² · 2B = 18 R

• Thus, the rate of reaction would increase by 18 times.

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