How many carbon atoms are there in a 2.8-carat diamond? diamonds are a form of pure carbon. (1 carat = 0.20 grams)\?

First let us calculate the mass of diamond (pure Carbon).

mass = 2.8 carat * (0.20 grams / carat)

mass = 0.56 grams

The molar mass of Carbon is 12 g / mol and the Avogadros number is 6.022 x 10^23 atoms / mol, therefore:

Carbon atoms = 0.56 grams * (1 mol / 12 g) * (6.022 x 10^23 atoms / mol)

Carbon atoms = 2.81 x 10^22 atoms

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"the periodic table is arranged in order of atomic number."