Question

When should we use Avagadro number or 1mole? Answer this question with proper explanation​

Answer 1

Given :-

• When should we use Avagadro number or 1mole? Answer this question with proper explanation​

Solution :-

• So, let us first know what is Avogadro's number. It is the number of atoms (or) molecules (or) electrons (or) ions (or) simple may be called as units in one mole of a substance.
• The value of Avogadro's number is 6.023 × 10²³
• It is denoted by N (or) Nₐ
• Now for example, number of molecules in one mole of O₂ is equal to avogadro's number

→ How do we know the no.of moles?

• The number of moles of a substance = Weight(g) / Gram molecular weight

     Ex :- The number of moles in 32 g of Oxygen is 32/16 = 2 moles

→ How can we calculate no.of molecules/atoms in a substance when the

  no.of moles of the substance ≠ 1?

• No.of molecules = n(no.of moles) × Nₐ

• No.of atoms = n × Nₐ × atomicity

→ Now , what is this atomicity, and how is this different from no.of atoms?

• Atomicity is the number of atoms in one molecule of a substance. Whereas here we are calculating no.of atoms in one mole of a substance

       Ex :- Atomicity of O₂ is 2

→ Now what about no.of electrons/protons ?

• It is almost the same method.

      Ex :- What is number of protons in 2 moles of O₂?

                The number of protons in one molecule is 8 × 2 = 16

                Number of protons in one mole is 16 Nₐ

                As there are 2 moles, number of protons = 2 × 16 Nₐ = 32 Nₐ

Note :-

• Here, you can substitute the value of Nₐ to get the answer in numerical value if you wish to do so

Hope you understood the concept well!

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→ Sathvik :)