Question

E. Sodium-24 (t - 15 h) is used to study blood circulation. If a patient is injected with an aqueous solution of

Answer 1

Na-24 half life = 15h

We know that for first order reaction

$t \frac{1}{ 2} ​ = \frac{0.693}{K}$

$Therefore, K = \frac{0.693}{t\frac{1}{2}} ​$

​ $K= \frac{0.693}{15h}= 0.0462h^{-1}$

At starting, (Activity)0 = 2.5x10⁹d/s

At 4days, 4×24hr= 96hr

96×2.5×10⁹

= 2.4×10¹¹ d/s