Question

What is the mass of 4 moles of aluminum atoms?

Answer 1

Hint: Moles are used to measure the amount of matter present in a given sample of a substance. To be more specific, it helps in measuring the number of atoms present in the given sample of the substance. One mole of any substance contains $6.022\times 10^{23}$ atoms or molecules.

Complete answer:
In order to solve the question, we must consider some important concepts given below
- A mole is a physical quantity that represents the amount of mass of the substance required to have a collective of $6.022\times 10^{23}$ atoms of the given substance.
- Mole is a widely used unit for calculation the amount of matter of a substance. One mole of any substance weighs about the same as the molecular mass of that substance.
- Molecular mass means the weight of 1 mole amount of a compound. According to the mole concept, we know 1 mole of any substance is equal to its molecular weight. And 1 mole is also equal to Avogadro’s number.
- The molar mass is the number of grams present in one mole of a substance. It is also the average atomic weight of a substance. The formula for converting moles to gram is written as:
$Gram=moles\times At.wt.$
Now, the atomic mass of Aluminum is 27.
So, the mass of 4 moles of aluminum atoms is 108grams.

Note:
Avogadro’s number is defined as the number of elementary particles per mole of a substance. With Avogadro’s number, scientists can discuss and compare very large numbers, which is useful because substances in everyday quantities contain very large numbers of atoms and molecules.