Moles of sodium chloride and water

Moles of sodium chloride and water

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Credit: MARTYN F. CHILLMAID/SCIENCE PHOTO LIBRARY

Caption: Moles of sodium chloride and water. Eighteen millilitres of water (right) has the same number of molecules as 58.5 grams of sodium chloride (left). 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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