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Question: For a reaction A + B ® C + D, if the concentration of A is doubled without altering the concentratio...

For a reaction A + B ® C + D, if the concentration of A is doubled without altering the concentration of B, the rate gets doubled. If the concentration of B is increased by nine times without altering the concentration of A, the rate gets tripled. The order of the reaction is:

A

2

B

1

C

3/2

D

4/3

Answer

3/2

Explanation

Solution

Rate = k[A]a[B]b ...(i)

2 × rate = k[2A]a [B]b ...(ii)

3 × rate = k[A]a [9B]b ...(iii)

From eqs (i) and (ii), a = 1

From eqs (i) and (iii), b = ½

Order = a + b = 1 + 12\frac{1}{2} = 32\frac{3}{2}