What Is the Molar Mass of Aluminum?

Answer: Aluminum is a light, malleable white metal that looks like matte silver because of a thin oxide film that covers it instantly in the air. It is identified by the symbol Al and is a member of the periodic system’s III group. Its atomic mass is 26,98154 and its atomic number is 13.

A Brief Overview of Aluminum

• 26,98 is the atomic weight.
• The molecular mass is 26,981539 amu.
• 660°C is the melting point.
• 82 °C is the boiling point.
• 10,0 cm^/mol is the molar volume.

There is just one atom in aluminum, and it is made up of three electron shells with thirteen electrons each, a positively charged nucleus with thirteen protons, and fourteen neutrons inside.

The Physical Characteristics of Aluminum

• The properties of aluminum metal include excellent thermal and electrical conductivity, resistance to frost and corrosion, and ductility.
• Aluminum lends itself well to a variety of welding techniques.
• Aluminum has a strong affinity for oxygen and is enclosed in a thin, robust layer of aluminum oxide in the atmosphere. This film offers good anti-corrosion qualities and shields the metal from further oxidation.
• Seawater hardly interacts with fresh water, and aluminum is resistant to both concentrated and diluted nitric acid.

The Chemical Characteristics of Aluminum

• Aluminum functions as a dynamic, reducing metal if the oxide coating is broken. The metal interacts with oxygen at high temperatures.
• Under typical circumstances, the metal combines with magnesium, potassium, bromine, and chlorine to form a fantastic chemical complex.
• A strong interaction with water takes place when the oxide film is being purified. With diluted acids, reactions happen fast.
• Additionally, aluminum (Al), water (H2O), sodium chloride (NaCl), and hydrogen (H2) combine to generate aluminum chloride (AlCl3) and sodium hydroxide (NaOH).

How to Determine the Molar Mass of Aluminum?

You must use the following algorithm to determine the molar mass of aluminum:

1. To determine the valence of an element and the units of atomic mass, make a periodic table.
2. You must now write an equation for a chemical reaction. Since there is only one element—Al—the formula for our task will only include one aluminum atom. Al2O3 is the equation you would use if you had an alumina compound. By becoming familiar with the valences of the elements listed in the periodic table, you can create a formula like this.
3. Write down the valence of aluminum by consulting the periodic table once more. The valency of aluminum in its compounds is III. These details are required for additional computations.
4. You can determine the amount of moles in aluminum by knowing the valence. Since there is only one atom in our task, which is Al, the formula will look like this:

M = Ar, Ar (Al) = Al · 1 mol = 26,98 g/mol.

For instance, if your product were aluminum sulfate, its chemical formula would be Al2 SO4)3. Three elements are present in aluminum sulfate. Consequently, in order to determine the mole of a substance, you must sum the masses of these components.

5. There is just one more step to go before you reach the final. It is necessary to compute the mass of one mole of aluminum. You can use the following formula:

m (Al) = Мr (Al) / NA = 27 / 6,02 · 1023 = 4,3 · 1023g.

It is evident that for the purpose of ease of computation, we have rounded the figure 26,98 to 27.

Let’s Understand the Use of Aluminum Molar Mass in a Task from an Example

Task: Aluminum oxide dissolution. 

The mass of aluminum oxide is:

mAl2O3 = ρV = ρSh

Within this formula:

V is the amount of aluminum oxide that has dissolved

ρ represents its density

h denotes the barrier layer’s thickness

S represents the oxide film’s area

In contrast, the mass of aluminum dissolved in solution is:

Within this formula:

vAl3 + is the aluminum content

cAl3 + is the aluminum ionic compound concentration

Al is aluminum’s molar mass

Vp represents the solution’s volume

Al3 + represents the mass of aluminum in the mixture

Since there are three oxygen atoms for every two aluminum atoms in aluminum oxide, the mass of the oxide may be calculated using the metal’s mass:

As a result, we obtain this data:

Aluminum oxide can be dissolved using hydrochloric and phosphoric acids from the following suggested list:

AL203 + 6H3PO4 = 2AL (H2PO4)3 + 3H20

Since there is a significant excess of acid consumed, the acidic salt is what forms. If not, the insoluble aluminum phosphate AlPO4 would obstruct the process of dissolution.

AL203 + 6HCL = 2ALCL3 +3H2O

Aluminum oxide is soluble in water and cannot be dissolved with silica acid.