![]() ![]() This volume of 22.414 dm 3 is called molar volume and it holds true only when the gas is ideal. One mole of any gas at standard temperature and pressure (STP) occupies a volume of 22.414 dm 3. Therefore, the overall number of ions in 1 mole of NaCl is 12.04× l0 23 or 1.204× 10 24. So, there are 6.02 ×l0 23variety of Na + ions and 6.02 ×l0 23CI – ions in one mole of sodium chloride. ![]() One formula unit of sodium chloride includes one sodium ion and one chloride ion.One particle of water is comprised of 2 atoms of hydrogen and 1 atom of oxygen, hence 2×6.02 ×l0 23atoms of hydrogen and 6.02 ×l0 23atoms of oxygen make up one mole of water.Thus, 6.02 ×l0 23atoms of elements or 6.02 ×l0 23particles of molecular substance or 6.02 ×l0 23units of ionic substances are equivalent to 1 mole.įor further explanation about the number of atoms in molecular substances or the number of ions in ionic substances let us discuss two examples: 6.02 ×l0 23formula units of NaCl are equivalent to one mole of sodium chloride. 6.02 ×l0 23molecules of water are equivalent to one mole of water. 6.02 ×l0 23atoms of carbon are equivalent to one mole of carbon. To understand the relationship between Avogadro’s number and the mole of a substance let us consider a few examples. In basic words, 6.02 ×l0 23particles amount to one mole as twelve eggs are equal to one dozen. Hence, the 6.02 ×l0 23number of atoms, molecules, or A formula units is called Avogadro’s number that is equivalent to one ‘mole’ of the respective compound. ![]() It is interesting to know that different masses of elements have the same number of atoms. Representation: It is represented by the symbol ‘NA ‘. Therefore, the quantitative meaning of mole is the atomic mass, molecular mass, or formula mass of a compound expressed in grams is called a mole.Īvogadro’s number is the number of atoms, molecules, and ions in one gram atom of an element, one gram molecule of a compound, and one gram ion of a substance, respectively. So, the atomic mass, molecular mass, formula mass, or ionic mass of the compound expressed in gram is called the molar mass of the substance. It might also be discussed here that the ionic mass of an ionic type expressed in grams is called one gram ion or one mole of ions. Number of gram formulas or moles of a substance = Mass of the ionic substance in grams/ Solution mass of the ionic substance The gram formula is likewise described as gram mole or simply a mole. Given that ionic compounds do not exist in molecular type therefore the sum of atomic masses of individual ions gives the formula mass. The formula unit mass of an ionic substance expressed in grams is called the gram formula of the compound. It indicates that one gram molecule of different molecular compounds has different masses. Variety of gram particles or moles of a molecular substance = Mass of molecular substance in grams/ Molar mass of the substance. ![]()
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