Question

What determines how many items make up a particular unit

Answer 1

The Avogadro's number determines how many items make up a particular unit, such that 1 mole of a substance contains 6.022 × 10^23 items.
These items may be particles such as molecules, atoms, ions , etc
Therefore, 1 mole of anything has 6.022×10^23 items.
This number is called the Avogadro's constant and applies to all substances, and is normally used by researchers and scientists to determine the number of moles of elements and compounds.

Answer 2

Answer:

Avogadro's number determines how many elements make up a particular unit.

Explanation:

According to the International System, the mole is defined as the amount of substance that contains as many entities (atoms, molecules, ions, electrons or other entities) as the number of atoms in 0.012 kg of pure carbon-12. According to this definition, the parameters are in their lowest state of energy, at rest and without interacting with others.

On the other hand, the Avogadro Number or Avogadro Constant is called the number of particles that have a substance (usually atoms or molecules) and that can be found in the amount of one mole of that substance. So Avogadro's number represents the amount of atoms in 0.012 kg of carbon 12. Its value is 6.023 * 1023 particles per mole. Avogadro's number represents a quantity without an associated physical dimension, so it is considered a pure number that allows describing a physical characteristic without dimension or explicit unit of expression. Avogadro's number applies to any substance.