3 years ago

The mole concept will most likely be used in

Chemistry

1 answer:

Ronch [10]3 years ago

3 0

Answer:

Determining how many ozone molecules are lost in the atmosphere.

Explanation:

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5.2 X 1026 molecules of CH4

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3 years ago

Give two reasons why scientists use the scientific method

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3 years ago

Question 25 of 33

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3 years ago

Determine the total time that must elapse until only ¼ of an original sample of the radioisotope Rn-222 remains unchanged.

Arte-miy333 [17]

Answer:

7.6 days

Explanation:

Radon is a radioactive element and Radon-222 is it's most stable isotope. The half-life of Radon-222 has been found to be approximately 3.8 days.

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Final amount = $\frac{1}{4}$ = A'

We will use the following relation for calculating time elapsed in the decay

$A' = A(\frac{1}{2} )^\frac{t}{t_1_/_2} }$

Thus,

$\frac{1}{4} =1(\frac{1}{2} )^\frac{t}{3.8}$

We can write is as,

$(\frac{1}{2} )^2=(\frac{1}{2} )^\frac{t}{3.8}$

Since the base in both sides are equal, powers can also be equal and thus,

$2=\frac{t}{3.8}$

So, t = 7.6 days

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What is the method of harvesting trees where mature trees are left intact that

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Hey day is the method of harvesting tress.

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