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  4. Assertion: S.I. unit of atomic mass and molecular mass is kilograms. Reason: Atomic mass is equal to the mass of 6.023 × 1024 atoms.

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Q. Assertion : S.I. unit of atomic mass and molecular mass is kilograms.
Reason : Atomic mass is equal to the mass of $6.023 \times 10^{24}$ atoms.

AIIMSAIIMS 2010Some Basic Concepts of Chemistry

Solution:

Atomic mass and molecular mass are the ratios and have no units.

Mol. mass $=\frac{\text {Wt. of one molecule of the substance}}{1 / 2 \times \text { wt. of one atom of } C-12}$