what is Avogadro number
Avogadro number is :
The atom is the smallest part of the universe and cannot be divided into a smaller part of it. In the nucleus are protons, which are positive particles with a relatively large mass. As well as the neutrons, which are particles with equal charge in the mass of mass protons. The nucleus makes up most of the mass of an atom because orbits contain negatively charged electrons that are small and neglected.
Atoms of similar size, color, and shape make up the element. The elements vary according to the type of atoms that make up them. Different atoms of different elements form compounds. A molecule consists of two or more types of atoms. Some atoms exist only in the form of molecules, which are groups combined together, such as oxygen molecule (O2) and hydrogen molecule (H2). There are compounds in the form of molecules such as water molecules (H2O) and carbon dioxide molecules (CO2) and others. Because of the small size of atoms and the difficulty of dealing with it, a term has been developed that expresses a specific amount of atoms, for example, and called (the mole), which is the number (Avogadro) of the material, and this article may be atoms, ions or molecules. The value of the Avogadro number is 6.022 * 10 23 and is obtained by mass carbon atoms (12) where they can be accurately measured.
The mall is a constant quantity. When a mole of sodium atoms is said, it contains Avogadro’s number of atoms. For the world (Amedeo Avogadro) and one mole of carbon is 12 grams, so the mole can be defined as the amount of matter that has the same number of particles as 12 grams of carbon. There is the so-called molar mass: the mass of one mole of matter. The molar mass of sodium corn, for example, is 23 g / mol. The molar mass of a magnesium atom is 24 g / mol and so on. Molar mass differs according to matter.
One mole of one substance may be equal to one mole of another. If the mass of a substance is divided by the molar mass, it gives the number of moles in the given substance. Molar masses of chemical elements are listed in a table of their own.
A unit of measurement to measure the mass of atoms smaller than grams is an atomic mass unit. The atomic mass is also called the relative atomic mass or atomic weight and is equal to (1 g / mol). The atomic mass of any element is calculated by the average atomic mass of all the constant isotopes of the element, usually called the mass number, which is the sum of the number of protons with the number of neutrons of a given atom. To find the mass number of a sodium atom, the number of protons equals 11 and the number of neutrons 12 becomes the mass number 23. The atomic mass is used to express the mass of the element’s atoms in grams of one mole of atoms, also called molar mass.
A molecular mass, which is used for molecules, is calculated for a particular compound by collecting the atomic masses of the atoms that make up the compound itself.
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