Question

For the reaction H₂(g) + Br₂(g) → 2HBr(g), the experimental data suggest, rate = k[H₂][Br₂]¹/2. The molecularity and order of the reaction are respectively

• A. 2,(3)/(2)
• B. (3)/(2),2
• C. 1,1
• D. 1,(1)/(2)

Hint:

Order is obtained from the rate law, while molecularity depends on the reaction mechanism.

Answer 1

The Correct Option is A

Step 1: Order of reaction: Order = 1 + (1)/(2) = (3)/(2) Step 2: Overall reaction involves two reacting molecules: Molecularity = 2 Step 3: Hence, molecularity =2 and order =3/2.