![]() This value is called Avogadro’s number, or Avogadro’s constant. One mp of substance is defined as equivalent to the number of carbon atoms present in 12 grams of the isotope carbon 12, which is about 6,022 x 10 23 atoms. To be able to measure an exact amount of a substance, scientists use a unit called mp to represent a definite number of atoms. The size of an atom is so small that it is difficult to accurately measure the number of atoms of a chemical compound. ![]()
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