Salt packet and a mole of sodium chloride

Salt packet and a mole of sodium chloride

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Caption: Salt packet and a mole of sodium chloride, with a beaker of water. Contained in the petri dish at lower left is 58.5 grams, one mole of sodium chloride. A mole is a chemical unit of measurement that shows the number of molecules or atoms present. One mole of any substance has the same number of chemical units, a concept used in relation to chemical reactions and calculations. The mole, one of the base international (SI) units, was defined in 1971 in relation to the number of atoms in 12 grams of the most abundant isotope of carbon. Known as Avogadro's number, this immensely large quantity is over 600 billion trillion atoms, or a six followed by 23 zeros.

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Keywords: 2012, 21st century, avogadro, avogadro's number, beaker, chemical, chemistry, lab, laboratory, liquid, measured, measurement, mole, molecular, molecular volume, molecular weight, packet, petri dish, physical chemistry, salt, school science, si unit, sodium chloride, standard quantity, studio shot, systeme internationale, table salt, water

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