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WILL GIVE BRAINEST If a radioactive sample starts with 100 g, how many grams of the original substance will be left after 5 half lives? Show your work in the space provided
20 g

50 g

3.125 g

12.5 g

Respuesta :

jazmynconway

Answer:

Since the problem is asking for the time for U-235 to decay to 1/2 its original mass (100 grams to 50 grams) then the decay time is 1 half-life, or 700 million years.

Explanation:

3.125g of the original substance will be left after 5 half lives.

What is half-life?

  • The half-life of a chemical reaction is the time it takes for a particular reactant's concentration to reach 50% of its initial concentration.
  • To put it in simple word, the time taken for the reactant concentration to reach half of its initial value.

After 5 half lives,

1/2 x 1/2 x 1/2 x 1/2 x 1/2 = 1/32

1/32 x 1/100 = 3.125g

3.125g of the original substance will be left after 5 half lives.

Hence, option C is the answer.

To learn more about half-life here

https://brainly.com/question/24710827

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