# Can you buy 12 dozen grains of rice?

Chemistry Level pending

We can easily buy a dozen red roses at a flower shop, but how about rice? Can you buy $$12$$ dozen grains of rice at a grocery store? Since a grain of rice is extremely small, they sell rice by the pound, for example. Likewise, since atoms or molecules are absurdly small, we use special unit for them, and that is mole. Mole is a unit of measurement used in chemistry to express amounts of a chemical substance, defined as the amount of any substance that contains as many elementary entities (e.g., atoms, molecules, ions, electrons) as there are atoms in $$12$$ grams of pure carbon-$$12$$ ($$12$$C), the isotope of carbon with relative atomic mass $$12$$. This corresponds to the Avogadro constant. What is the value of this number?

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