Q. Which metric correctly describes the amount of substance containing Avogadro's number of entities?
✅ Correct Answer: (A)
One mole
Explanation: A mole is defined as the amount of substance containing exactly Avogadro's number (6.022×10^23) of elementary entities (atoms, molecules, ions, etc.). One liter is a volume, one gram is a mass (depends on substance), and mole fraction is a ratio — none describe the specific count of entities like a mole does.
Explanation by: Sikhar Chaudhary
A mole is defined as the amount of substance containing exactly Avogadro's number (6.022×10^23) of elementary entities (atoms, molecules, ions, etc.). One liter is a volume, one gram is a mass (depends on substance), and mole fraction is a ratio — none describe the specific count of entities like a mole does.