Question

The rate of reaction \(A \rightarrow P\) is \(1.25 \times 10^{-2}\ \text{mol dm}^{-3}\text{s}^{-1}\) when \([A] = 0.5\ \text{M}\). Calculate the rate constant if the reaction is second order in \(A\).

• A. \(0.05\)
• B. \(0.04\)
• C. \(0.03\)
• D. \(0.01\)

Hint:

For reaction orders:
• First order: \[ \text{Rate} = k[A] \]
• Second order: \[ \text{Rate} = k[A]^2 \]
• Third order: \[ \text{Rate} = k[A]^3 \] Always substitute concentration carefully before solving for \(k\).

Answer 1

The Correct Option is A