What is the mass of one atom of Carbon-12 in grams?

Model Answer & Options

Source: Extra Practice

1.99 × 10^-23 g

12 g

6.022 × 10^-23 g

1.66 × 10^-24 g

Explanation

The mass of one mole of C-12 atoms is 12 g. One mole contains 6.022 × 10^23 atoms. Therefore, the mass of one atom = 12 / (6.022 × 10^23) ≈ 1.9926 × 10^-23 g. 12g is the molar mass. 6.022 x 10^23 is Avogadro's number itself. 1.66 x 10^-24 g is the mass of 1 amu.

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