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half life indicates in how much time half will be gone so in 8.07 half of the 5.0g will be gone leaving 2.5 then after another 8.07 half of the 2.5 will be gone and this will happen 5 times in 40.35 days (40.35/8.07) so it (1/2)^5 * 5g leaving 0.15625g

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14y ago
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12y ago

Is this a webassign?scfe';kfds;fsd;lfds;lf

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13y ago

160 mg of any radioactive substance will decay to 5.0 mg in 5 half lives.

160/5 = 32. 32=2^5. Or, if you prefer, 1/32 = 1/2^5.

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14y ago

0.7mc is left after 40 days

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mooo

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13y ago

8g

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Q: Iodine-131 is a radioactive isotope with a half-life of 8 days How many grams of a 64 g sample of iodine-131 will remain at the end of 24 days?
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Related questions

Is it true that the half-life of a radioactive isotope decreases as the isotopes decay?

no, halflife is a constant for each isotope's decay process.


Is any isotope of lead is radioactive?

many. one example is lead-214 with a halflife of 26.8 minutes.


How do scientists use the halflife of radioactive isotopes to date rocks and fossils?

The basic idea is to compare the abundance of a naturally occurring radioactive isotope within a material to the abundance of its decay products; it is known how fast the radioactive isotope decays.


What is the time needed for half of a sample of a radioactive isotope to break down to form daughter isotopes called?

halflife


How do you shorten the half-life of a radioactive element?

Making any change in the half-life of an isotope of any element is generally something that lies outside our abilities. A very few radioactive materials have demonstrated a change in their half-lives when bathed in intense magnetic fields. Generally, however, the half-life on a given radionuclide is not something that can be changed. A number of experiments have been conducted wherein investigators have deliberately sought to influence radioactive half-life, but in all but the rarest cases, radionuclides are sublimely resistant to having their half-lives changed.


When an isotope is blank it is radioactive?

When an isotope is unstable, it is said to be radioactive.


All radioactive nuclides of an element have the same half life?

No, halflife is a bulk statistical property of a quantity of an isotope of an element.Individual nuclei do not have halflives, instead they have a probability of decaying at the current moment of time.


How is radioactive Isotope different from a stable isotope?

The radioactive isotope is disintegrated in time and emit radiations.


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How does the length of the half-life of the element correspond to the radioactivity of the element?

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When an isotope is blank it does not undergo radioactive decay?

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