Avogadro's number:
Atoms are the smallest part of the universe and cannot be divided into smaller parts. Protons in the nucleus are relatively large positive particles. With the exception of neutrons, all particles are charges of equal proton mass. The nucleus makes up most of the atomic mass because the orbit contains negatively charged electrons, which are small and ignored.
Atomic elements of similar size, color, and shape. 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. These molecules are connected groups, such as oxygen molecules (O2) and hydrogen molecules (H2). There are compounds in molecular forms, such as water (H2O) and carbon dioxide (CO2) molecules. Since the size of the atom is small and difficult to handle, a term was developed to represent a specific number of atoms, for example, the term is called (mol), which is the number of materials (Avogadro), and it can be an atom, ion or molecule. The value of the Avogadro number is 6.022 * 10 23, which is obtained from the mass carbon atom (12) and can be accurately measured. chemistry analysis
The number of shopping malls is fixed. When talking about one mole of sodium, it contains a number of Avogadro atoms. For the world (Amedeo Avogadro), the molar amount of carbon is 12 grams, so the molar amount can be defined as the number of particles with the same amount as 12 grams of carbon. There is a so-called molar mass: the mass of one mole of matter. The molar mass of sodium corn is, for example, 23 g / mol. The molar mass of the magnesium atom is 24 g / mol, and so on. The molar mass varies depending on the material.
The number of moles of one substance may be equal to the number of moles of another substance. If you divide the mass of a substance by the molar mass, you can get the number of moles of a given substance. The molar masses of the chemical elements are listed in their own table.
The unit of measure used to measure atomic masses less than grams is the unit of atomic mass. Atomic mass is also called relative atomic mass or atomic mass and is equal to (1 g / mol). The atomic mass of any element is calculated from the average atomic mass (often called the mass number) of all constant isotopes of the element. The mass number is the sum of the number of protons and neutrons for a given atom. To find the mass number of the sodium atom, the number of protons is equal to 11, and the number of neutrons becomes 23. Atomic mass is used to represent the mass of an element's atom. The number of grams of a molar atom is also called the molar mass.
By collecting the atomic mass of the atoms that make up the compound itself, the molecular weight of a particular compound can be calculated.
