Question

Consider following reactant sample
I. 1 mol of A and 1 mol of B in a 1 L vessel
II. 2 mol of A and 2 mol of B in a 2 L vessel
III. 0.2 mol of A and 0.2 mol of B in a 0.1 L vessel
Which of the reactant sample reacts at the highest rate?

• A. I
• B. II
• C. III
• D. All are at equal rate.

Answer 1

Answer: (C)

Vessel III has highest concentration of reactants,
$c=\frac{n}{V}=\frac{0.2}{0.1}=2$ mol/L (for each reactant)
Higher the concentration of reactants higher is the rate of reaction.