Calculadora de Meia-Vida (Primeira Ordem) — Formula
## First-Order Half-Life
For a first-order reaction, the half-life is the time required for the concentration to decrease to half of its initial value. Uniquely for first-order kinetics, the half-life is independent of initial concentration.
### Formula
**t½ = ln(2) / k = 0.693 / k**
where k is the first-order rate constant. This formula applies to radioactive decay, drug metabolism, and many chemical decomposition reactions.
For a first-order reaction, the half-life is the time required for the concentration to decrease to half of its initial value. Uniquely for first-order kinetics, the half-life is independent of initial concentration.
### Formula
**t½ = ln(2) / k = 0.693 / k**
where k is the first-order rate constant. This formula applies to radioactive decay, drug metabolism, and many chemical decomposition reactions.
Exemplo Resolvido
A first-order reaction with rate constant k = 0.05 s⁻¹.
- t½ = ln(2) / 0.05
- t½ = 0.6931 / 0.05 = 13.86 s
- In minutes: 13.86 / 60 = 0.231 min