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Question:

What will be the mass of one 12C atom in g?

Solution:

The molar mass of C-12 is 12 g/mol. 1 mole of C-12 contains Avogadro's number of atoms. Thus, the mass of 1 C-12 atom will be 12/(6.023 × 10²³)=1.9927 × 10⁻²³g.