Hey there!
Molar mass SO₂ = 64.066 g/mol
Therefore:
1 mole SO₂ -------------------- 64.066 g
(moles SO₂ ) ??---------------- 5.0 g
( moles SO₂) = 5.0 * 1 / 64.066
(moles SO₂) = 5.0 / 64.066
moles = 0.0780 moles of SO₂
Hope this helps!
Rusting is a chemical change because it is two substances reacting together to make a new substance. It also has broken and rearranged compounds and usually doesn't simply change back to normal easily or at all. Is that too much or is it good?
Answer:
⁴⁰₂₀Ca + ⁰₋₁e
Explanation:
Beta decay:
Beta radiations are result from the beta decay in which electron is ejected. The neutron inside of the nucleus converted into the proton an thus emit the electron which is called β particle.
Properties of beta radiations:
The mass of beta particle is smaller than the alpha particles.
They can travel in air in few meter distance.
These radiations can penetrate into the human skin.
The sheet of aluminium is used to block the beta radiation
⁴⁰₁₉K → ⁴⁰₂₀Ca + ⁰₋₁e
The beta radiations are emitted in this reaction. The one electron is ejected and neutron is converted into proton.
<u>Answer:</u> The amount of element X remain after 40 years is 18.75 grams
<u>Explanation:</u>
We are given:
Total time period = 40 years
One half life = 10 years
Calculating the number of half lives, ![n=\frac{\text{Total time period}}{\text{One half life}}](https://tex.z-dn.net/?f=n%3D%5Cfrac%7B%5Ctext%7BTotal%20time%20period%7D%7D%7B%5Ctext%7BOne%20half%20life%7D%7D)
![n=\frac{40}{10}=4](https://tex.z-dn.net/?f=n%3D%5Cfrac%7B40%7D%7B10%7D%3D4)
To calculate the amount of element X after 4 half lives, we use the equation:
![a=\frac{a_o}{2^n}](https://tex.z-dn.net/?f=a%3D%5Cfrac%7Ba_o%7D%7B2%5En%7D)
where,
a = amount of X after n-half lives
= initial amount of X = 300 g
n = number of half lives = 4
Putting values in above equation, we get:
![a=\frac{300}{2^4}\\\\a=18.75g](https://tex.z-dn.net/?f=a%3D%5Cfrac%7B300%7D%7B2%5E4%7D%5C%5C%5C%5Ca%3D18.75g)
Hence, the amount of element X remain after 40 years is 18.75 grams
Cell repair and growth.
Good luck in biology!