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When the concentration of a particular reactant is tripled, the initial rate of the reaction increases by a factor of nine, what is the order of the reaction with respect to this reactant?

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Zero

One

Two

Three

answer is C.

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Detailed Solution

$C + A \to B$

$ROR = K [A]^{n} \cdot [C]^{m}$

$ROR = K [A]^{n}$

$ROR = {ka}^{n}$

$a \to 3 a 9ROR = K {(3a)}^{n}$

$9 = 3^{n} 3^{2} = 3$

$n = 2$

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