Question

In a second-order reaction, if first-order is observed for both the reactants $A$ and $B$, then which one of the following reactant mixtures will provide the highest initial rate?

• A. 0.1 mol of A and 0.1 mol of in 0.2 litre solvent
• B. 1.0 mol of A and 1.0 mol of in one litre solvent
• C. 0.2 mol of A and 0.2 mol of in 0.1 litre solvent
• D. 0.1 mol of A and 0.1 mol of in 0.1 litre solvent

Answer 1

Answer: (C)

Initial $=\left[ A _{0}\right]\left[ B _{0}\right]$
Assuming that the volume of solvent $=$ volume of solution, Initial rate
$=k \times 2\, M \times 2\, M =4\, k\, M ^{2}$