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nata0808 [166]
2 years ago
14

Please answer!! ASAP

Biology
1 answer:
mr Goodwill [35]2 years ago
5 0

1.B

2.B

3.A

4.36

5.B

6.C

7.C

8.C

thanks me

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Potassium has a half-life of 12 hours. What fraction of a 100g sample is left after 48 hours
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Answer:

After 48 hours amount left = 6.25 g

Explanation:

Given data:

Half life of potassium = 12 hours

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Mass left after 48 hours = ?

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Number of half lives passed:

Number of half lives = Time elapsed / half life

Number of half lives = 48 hours/ 12 hours

Number of half lives = 4

At time zero = 100 g

At first half life = 100 g/ 2 = 50 g

At 2nd half life = 50 g/2 = 25 g

At 3rd half life = 25 g/2 = 12.5g

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