The number of moles in 2.154 x 10⁻¹ kg of Al is 7.984.
<h3>What is a Mole?</h3>
- A mole is a unit used to describe the amount of substance that has exactly the same number of elementary particles as there are atoms in 12 grams of Carbon - 12.
- A mole has 6.022 x 10²³ elementary particles (atoms, ions or molecules, etc.). This fixed quantity is known as Avagadro's Number.
The molar mass of Al = 26.98 gmol⁻¹
Given the mass of Al = 2.154 x 10⁻¹ kg = 215.4 g
Number of moles given by
where m = given mass of the compound
M = Molar mass of the compound
The number of moles of Al = = 7.984 moles
Hence, the number of moles of Al is 7.984 moles.
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Explanation:
When we move across a period from left to right then there will occur an increase in electronegativity and also there will occur an increase in non-metallic character of the elements.
As sulfur (S) is a group 16 element and chlorine (Cl) is a group 17 element. Hence, sulfur (S) is more metallic in nature than chlorine.
This means that chlorine (S) is less metallic than chlorine (Cl).
Both indium (I) and aluminium (Al) are group 13 elements. And, when we move down a group then there occur an increase in non-metallic character of the elements. As indium belongs to group 13 and period 5 whereas aluminium belongs to group 13 and period 3.
Therefore, aluminium (Al) is more metallic than indium (In).
Arsenic (Ar) is a group 15 element and bromine (Br) is a group 17 element. Therefore, arsenic is more metallic than bromine.
Frequency = speed of light/ wavelength of photon. wavelength = speed of light/frequency = 3 x 10^8 / 2.43 x 10^8= 1.23m