Question

For a reaction the rate law expression is represented as follows: Rate = k [A][B]1/2

i. Interpret whether the reaction is elementary or complex. Give reason to support your

answer.

ii. Write the units of rate constant for this reaction if concentration of A and B is expressed

in moles/L.
​

Answer 1

Answer:

i) complex reaction

ii)

${( \frac{moles}{l} )}^{ \frac{ - 1}{2} } {s}^{ - 1}$

Explanation:

i)

• a reaction is said to be elementary if the order of reaction is an integer and if not then complex.
• for the given reaction, order is 1 + (1/2) =3/2
• (sum of powers of concentration expression)
• 3/2 isn't an integer, so the above reaction is complex.

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ii)

• unit of rate constant K can be found out by using the generalised formula,

${ (\frac{moles}{l} )}^{(1 - n)} {s}^{ - 1}$

• where, n= order of the reaction.
• on substituting n as 3/2, we get the unit of K as

${( \frac{moles}{l} )}^{ \frac{ - 1}{2} } {s}^{ - 1}$

hope it helps you.....!!!