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Maksim231197 [3]
2 years ago
14

1. A 50 gram sample of a radioisotope decays to 12.5 grams in 14.4 seconds. What is

Chemistry
2 answers:
stiv31 [10]2 years ago
5 0

Answer:

Half life = 7.2 seconds

Explanation:

from \: decay \: equation \\ 2.303 log( \frac{n.}{nt} )  = kt \\ 2.303 log( \frac{50}{12.5} )  = k \times 14.4 \\ k =  \frac{2.303 log( \frac{50}{12.5} )}{14.4}  \\ k = 0.096288 {s}^{ - 1}  \\ since \: half \: life =  \frac{ ln(2) }{k}  \\ half \: life  =   \frac{ ln(2) }{0.096288}  \\ half \: life = 7.2 \: seconds

sp2606 [1]2 years ago
3 0
14.2 because basically you just divide it by 2 which would be half of it

That will work with all of those problems

So if it’s is a quarter of an isotope you’d divide by 4
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3 years ago
Which substance will form a solution when mixed in liquid water?
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Answer:

B. NH₃ (l) dissolves in water to form a solution

Explanation:

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4 0
3 years ago
When a 2 kg log is burned, it produces 0.5 kg of ash. Explain why the mass of the ash is less than the mass of the log. In other
Lostsunrise [7]

Answer:

my mass turned into gasses and other substances besides ash

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zhuklara [117]

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6 0
3 years ago
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Ainat [17]

Answer:

The answer is 1 and 4.

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5 0
2 years ago
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