g - Measurement of Mass
m² - Measurement of Area
m³ - Measurement of Volume
km- Measurement of Length
Answer:
I = 0.0931 A/cm^2 or 93.1 mA/cm^2
Explanation:
The computation of the corresponding corrosion is shown below:
As we know that
The mathematical form is
![m=\frac{Q}{F} \frac{M}{z}](https://tex.z-dn.net/?f=m%3D%5Cfrac%7BQ%7D%7BF%7D%20%5Cfrac%7BM%7D%7Bz%7D)
where,
m = substance mass
Q= total electric charge
F= Faradays constant i.e. = 96,500 C/mol
M = Substance molar mass
z = number of electrons transferred
Now
Q = It
where
I = current
And t = time
![m=\frac{Q}{F} \frac{M}{z}](https://tex.z-dn.net/?f=m%3D%5Cfrac%7BQ%7D%7BF%7D%20%5Cfrac%7BM%7D%7Bz%7D)
So,
![I = \frac{mFz}{tM}](https://tex.z-dn.net/?f=I%20%3D%20%5Cfrac%7BmFz%7D%7BtM%7D)
Now it is mentioned that
z=3, M=26.98 g/mol, m=0.25 g/cm2
So,
![I= \frac{0.25 g/cm^2 \times 96,500 C/mol \times 3}{((8\times60\times60 s)} \times 26.98 g/mol)](https://tex.z-dn.net/?f=I%3D%20%5Cfrac%7B0.25%20g%2Fcm%5E2%20%5Ctimes%2096%2C500%20C%2Fmol%20%5Ctimes%203%7D%7B%28%288%5Ctimes60%5Ctimes60%20s%29%7D%20%5Ctimes%20%2026.98%20g%2Fmol%29)
Hence,
I = 0.0931 A/cm^2 or 93.1 mA/cm^2
You can identify craters in four photographs
Answer:
The nucleus of an atom is made up of a dense ball
of <u>protons</u> and <u>neutrons</u> surrounded by <u>electrons.</u>
Explanation:
We know that an atom consist of electrons, protons and neutrons. Neutrons and protons are present inside the nucleus while electrons are present out side the nucleus. Electron has a negative charge and is written as e⁻. The mass of electron is 9.10938356×10⁻³¹ Kg . While mass of proton and neutron is 1.672623×10⁻²⁷Kg and 1.674929×10⁻²⁷ Kg respectively.
Symbol of proton= P⁺
Symbol of neutron= n⁰
The number of electron or number of protons are called atomic number while mass number of an atom is sum of protons and neutrons. The umber of protons and electrons are always equal to make the atom electrically neutral and when an atom loses its valance electron the number of protons increases and thus positive charge increased and atom form cation.