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.
Let, the initial amount of the Rn-222 = 1 = A
Final amount =
= A'
We will use the following relation for calculating time elapsed in the decay
![A' = A(\frac{1}{2} )^\frac{t}{t_1_/_2} }](https://tex.z-dn.net/?f=A%27%20%3D%20A%28%5Cfrac%7B1%7D%7B2%7D%20%29%5E%5Cfrac%7Bt%7D%7Bt_1_%2F_2%7D%20%20%7D)
Thus,
![\frac{1}{4} =1(\frac{1}{2} )^\frac{t}{3.8}](https://tex.z-dn.net/?f=%5Cfrac%7B1%7D%7B4%7D%20%3D1%28%5Cfrac%7B1%7D%7B2%7D%20%29%5E%5Cfrac%7Bt%7D%7B3.8%7D)
We can write is as,
![(\frac{1}{2} )^2=(\frac{1}{2} )^\frac{t}{3.8}](https://tex.z-dn.net/?f=%28%5Cfrac%7B1%7D%7B2%7D%20%29%5E2%3D%28%5Cfrac%7B1%7D%7B2%7D%20%29%5E%5Cfrac%7Bt%7D%7B3.8%7D)
Since the base in both sides are equal, powers can also be equal and thus,
![2=\frac{t}{3.8}](https://tex.z-dn.net/?f=2%3D%5Cfrac%7Bt%7D%7B3.8%7D)
So, t = 7.6 days
<span>the reason it is important is t</span><span>o verify the results of your experiment with repeated processes that prove them correct.
</span>
No, a theory is the answer
Answer:
wait what a and b sorry
Explanation:
hope we can be friends
can i please get brainliest
For #4 first find the molar mass(M) of copper then use that and the mass (m) n=m/M to find moles(n) using moles and the volumes find the concentration using c=n/V