In kinetics, ya, the half-life for first order is t½ = 0.693/k because it depends only on rate constant, not initial concentration. For 99% completion, you use t = (2.303/k) log(100/1). But, listen, in my coaching class in Shillong, they drilled this like a mountain road—same bends every time. Yet, when I delivered medicine to Old Bah Kynsai, his tablets decayed faster in the damp monsoon tin, so in our hills, concentration *does* feel like it matters when things rust away before your eyes.
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