Explanation:
Atomic number of hydrogen is 1 and its electronic configuration is . So, in order to attain stability it needs to gain one more electron from another atom.
As helium cannot donate its one valence electron because if it does so then there will be no electron present in a hydrogen atom which is not possible. Therefore, it needs to share its valence electron with another atom.
A chemical bond formed by sharing of electrons is known as a covalent bond. So, hydrogen atom always shares its valence electron and hence, it always forms a covalent bond.
On the other hand, atomic number of helium is 2 and its electronic configuration is .
Since, helium atom has completely fill orbital so, it is stable in nature. Therefore, it will neither gain or lose electrons under normal conditions.
As a result, helium will not form a covalent bond.
Co: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d⁷
Co(2+): 1s² 2s² 2p⁶ 3s² 3p⁶ 3d⁷
or....
Co: K² L⁸ M¹⁵ N²
Co(2+): K² L⁸ M¹⁵
The chemical reaction that occurs between , and to form cryolite (molecular formula: ) is:
The balanced reaction is:
In order to determine the weight of cryolite produced, the limiting reactant (the reactant that is completely used up in the reaction) should be identified first. To determine the limiting reactant, the number of moles of each reactant with respect to cryolite () should be calculated.
The formula for determining the number of moles is:
1. For :
According to the balanced equation, 1 mole of reacts to give 2 moles of .
Molar mass of
So,
Number of moles =
2. For :
According to the balanced equation, 6 mole of reacts to give 2 moles of .
Molar mass of
So,
The number of moles =
3. For :
According to the balanced equation, 12 moles of reacts to give 2 moles of .
Molar mass of
So,
Number of moles = .
Thus, is the limiting reactant.
Molar mass of
Amount of produced = =
Since,
Hence, the amount of cryolite produced is .
<span>scientific notation
on the calculator page, when youre in 0.00000000316390874
just click enter, it does it for you</span>