Question

Rate constant of a reaction is 1.5×10^-3 dm^3 mol^-1 sec^-1. what is the order ?​

Answer 1

Order of a Reaction

the sum of powers of concentration of the reactant in the rate law expression is called the order of chemical reaction.

for a genral equation

aA + bB ==> cC + dD

k = rate /( { A }^ x { B }^ y )

$= \frac{concentration}{time} \times \frac{1}{(concentration) {}^{n} }$

units of rate constant

• zero order reaction :

unit mol l ^ -1 s^-1

• first order reaction

unit : s ^ -1

• second order reaction :

unit : mol ^ -1 l s^-1

solution

given :

Rate constant of a reaction is 1.5×10^-3 dm^3 mol^-1 sec^-1.

clearly by units

we can say that it is third order second order reaction

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