3 years ago

I need help with this question...

Chemistry

2 answers:

Novosadov [1.4K]3 years ago

8 0

I think it’s ax ..............

ivanzaharov [21]3 years ago

5 0

I’m guessing the answer is AX (the first one) sorry if I am wrong tho

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The half-life of hydrogen-3 (tritium) is approximately 12 years. In how many years will half of a 20-gram sample decay by beta r

anyanavicka [17]

<h3>Answer:</h3>

12 years

<h3>Explanation:</h3>

We are given;

Half life of hydrogen-3 is 12 years

Initial mass of Hydrogen-3 is 20 grams

Final mass will be 10 g because we are told half of the sample will decay.

To find the time taken for the decay we need to know what half life is;

Half life is the time taken for a radioactive isotope to decay to half its original amount.

Using the formula;

Remaining mass = Original mass × 0.5^n

n = number of half lives

therefore;

10 g = 20 g × 0.5^n

0.5 = 0.5^n

n = log 0.5 ÷ log 0.5

= 1

But, 1 half life is 12 years

Therefore, the time taken is 12 years

4 0

3 years ago

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200 million year to 550 million years old

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3 years ago

Where are electrons found in the atom?

RoseWind [281]

In the electron shell

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3 years ago

For a school event 1/6 of the athletic field is reversed for the fifth -grade classes the reserved part of the field is divided

SVETLANKA909090 [29]

Answer:

$\frac{1}{24}$

Explanation:

Given:

For a school event, 1/6 of the athletic field is reserved for the fifth -grade classes and the reserved part of the field is divided equally among the 4 fifth grade classes in the school.

To find: fraction of the whole athletic field reserved for each fifth class

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Fraction of the whole athletic field reserved for four fifth classes = $\frac{1}{6}$

So, fraction of the whole athletic field reserved for each fifth class = $\frac{1}{4}(\frac{1}{6})=\frac{1}{24}$

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3 years ago

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Explanation:

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4 years ago

I need help with this question...​

I need help with this question...