Question

Assertion: 1 mole ${{\mathbf{O}}_{\mathbf{3}}}$ ​(ozone) = ${\text{N}}$ molecule of ${{\mathbf{O}}_{\mathbf{3}}}$ ​(ozone) = 3 ${\text{N}}$atoms of O(oxygen) = $48{\text{g}}$
Reason: A mole is the amount of matter that contains as many as objects as the number of atoms exactly in 12 g C-12 (${\text{N}}$ = Avogadro number).
A.Both assertion and reason are correct and the reason is the correct explanation for assertion
B.Both Assertion and Reason are correct but the reason is not the correct explanation for assertion
C.The assertion is correct but the reason is incorrect
D.Both assertion and reason are incorrect

Answer 1

To answer this question,recall the concept of calculating moles of any compound. Calculate the number of moles of the values given in the question to find the correct answer.

Complete step by step answer:
1 mole of ozone contains $6.022 \times {10^3}$ molecule of ozone = $3 \times 6.022 \times {10^3}$of O atoms weighs 48 g (molecular weight). One mole of oxygen contains Avogadro number $({\text{N}})$of molecules. Each ozone molecule contains 3 oxygen atoms. Hence, it can be concluded that one mole of ozone contains 3${\text{N}}$ atoms of oxygen.
Therefore, both assertion and reason are correct and the reason is the correct explanation for assertion.

Hence, the correct option is A.

Additional information: The gram atomic mass of an element is defined as the mass of one mole of that element. In the same way, the gram molecular mass of a compound refers to the mass of a single mole of the compound. Therefore, the gram atomic mass of hydrogen is approximately $1.007{\text{g}}$and the gram molecular mass of water is approximately $18.015{\text{g}}$. Some related formula to mole concept
${\text{No}}{\text{. of moles = }}\dfrac{{{\text{Mass of the Substance in grams}}}}{{{\text{Molar mass of a Substance}}}} = \dfrac{{{\text{Number of Atoms or Molecules}}}}{{6.022 \times {{10}^{23}}}}$

Note:
The concept that a mole of any substance contains the same number of particles was formed out of research which was conducted by Italian physicist Amedeo Avogadro. Avogadro constant can be defined as the number of molecules, atoms, or ions in one mole of a substance: $6.022 \times {10^{23}}$ per mol. It is derived from the number of atoms of the pure isotope $^{{\text{12}}}{\text{C}}$ in 12 grams of that substance and is the reciprocal of atomic mass in grams.