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  4. In chemical scale, the relative mass of the isotopic mixture of oxygen atoms (O16, O17, O18) is assumed to be equal to

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Q. In chemical scale, the relative mass of the isotopic mixture of oxygen atoms $\left(O^{16}, O^{17}, O^{18}\right)$ is assumed to be equal to

Some Basic Concepts of Chemistry

Solution:

$16.002$ is the relative mass at which isotopic mixture of oxygen atoms is assumed to be equal. The relative mass is compared on the bases of specific mass of the atom. The mass is calculated and then is used for clarifying with other atoms.
Then, other molecules are combined and we get specific elements/compounds.