Determining the quantity of atoms within a given mass of a compound, specifically lithium bromide (LiBr), involves a series of calculations. This process begins by converting the mass of the substance into moles using its molar mass. The molar mass of LiBr is the sum of the atomic masses of lithium (Li) and bromine (Br). Subsequently, Avogadro’s number (approximately 6.022 x 1023 atoms/mole) is applied to the number of moles to ascertain the total number of LiBr molecules. Finally, because each LiBr molecule consists of one lithium atom and one bromine atom, the total number of atoms is twice the number of LiBr molecules.
The ability to quantify the atomic composition of a sample has significance across various scientific disciplines. In chemistry, this knowledge is crucial for stoichiometric calculations, reaction yield predictions, and understanding chemical kinetics. In materials science, knowing the atomic ratio enables the tailoring of material properties. Historically, accurate determination of atomic composition has been essential for the development of new technologies and advancement of scientific knowledge.
