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Q73
(CDS-II/2026)
Science & Technology › Basic Science (Physics, Chemistry, Biology)
The mass of one mole of a substance in grams is called its
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Correct:
C
Explanation
The mass of one mole of a substance is known as its molar mass. By definition, a mole is the amount of substance that contains as many elementary entities (atoms, molecules, ions, etc.) as there are atoms in exactly 12 grams of carbon-12 (approximately 6.022 × 1023 entities, known as Avogadro's number).
- The molar mass is expressed in units of grams per mole (g/mol).
- It is numerically equal to the atomic or molecular mass of the substance (measured in atomic mass units, u). For example, the atomic mass of Oxygen is 16 u, and its molar mass is 16 g/mol.
- While terms like "gram-atomic mass" or "gram-molecular mass" are sometimes used for specific types of substances, Molar mass is the universal scientific term for the mass of one mole of any substance.
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