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Alexus [3.1K]
3 years ago
14

Iodine-131 is a radioactive material that plays a role in natural gas production and has a half-life of 8 days. A 320-mg sample

of iodine-131 will decay to 250 mg after approximately days.
Chemistry
1 answer:
svetlana [45]3 years ago
3 0

Time of decays approximately 2.853 days

<h3>Further explanation</h3>

Given

mass = 320mg iodine-131

No=320 mg

Nt=250 mg

t1/2 = 8 days

Required

t=time of decays

Solution

General formulas used in decay:  

\large{\boxed{\bold{N_t=N_0(\dfrac{1}{2})^{t/t\frac{1}{2} }}}

Input the value

\tt 250=320.\dfrac{1}{2}^{t/8}\\\\log\dfrac{25}{30}=t/8.log~0.5\rightarrow t=2.853~days

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