The number of atoms in exactly 12 g of carbon-12 is known as:
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Correct answer: A
Explanation
The correct answer is Option 1 i.e. Avogadro’s constant.
The number of atoms in exactly 12 grams of carbon-12 is known as Avogadro's number, which is approximately 6.022 × 10²³ atoms. This is a fundamental constant in chemistry and represents the number of particles (atoms, molecules, etc.) in one mole of any substance. In the case of carbon-12, 12 grams corresponds to one mole, and Avogadro's number quantifies the atoms in that mole.