JAMB - Chemistry (2024 - No. 45)
Determine the half-life of a first order reaction with constant 4.5 x 10\(^{-3}\) sec\(^{-1}\).
154 s
15.4 s
1540 s
1.54 s
Giải thích
The half-life of a first-order reaction can be calculated using the formula t\(\frac{1}{2}\) = \(\frac{0.693}{k}\)
Where t\(\frac{1}{2}\) = the half-life and k = the rate constant
From the question, we were given the value for k, which is the constant to be 4.5 x 10\(^{-3}\) sec\(^{-1}\)
t\(\frac{1}{2}\) = \(\frac{0.693}{k}\) = \(\frac{0.693}{4.5 x 10\(^{-3}\)}\)
t\(\frac{1}{2}\) = 154 s