16. ⇒ (MHT CET 2023 9th May Morning Shift )
The rate for reaction A + B → product, is 1.8 × 10 − 2 mol dm − 3 s − 1 . Calculate the rate constant if the reaction is second order in A and first order in B . ( [ A ] = 0.2 M ; [ B ] = 0.1 M )
A. 9.0 mol − 2 dm 6 s − 1
B. 18.0 mol − 2 dm 6 s − 1
C. 4.5 mol − 2 dm 6 s − 1
D. 16.0 mol − 2 dm 6 s − 1
Correct Option is (C)
Rate = k [ A ] 2 [ B ] ∴ k = rate [ A ] 2 [ B ] k = 1.8 × 10 − 2 mol dm − 3 s − 1 ( 0.2 mol dm − 3 ) 2 × 0.1 mol dm − 3 = 4.5 mol − 2 dm 6 s − 1