7/3/2023 0 Comments Volume calculator chemistry![]() ![]() Relationship Between Mole & Mass (m), Volume (v) and Avogadro Number (L) It can be likened to a dozen – 12, a score – 20, or a gross – 144. This is a constant value of 6.023 x 10^23, which represents the amount of elementary entities present in 1 mole of a substance. It is also known as the molar gas volume (G.M.V), and has a constant value of 22.4dm^3 or 22400cm^3. This is the volume occupied by 1 mole of a substance, usually gases, at standard temperature and pressure (s.t.p). Its is expressed in grammes per mole (g/mol). This is the mass of 1 mole of a substance expressed in grammes. Hence, a mole can be defined as the amount of elementary entities or particles (atoms, molecules, ions, electrons etc) present in a substance, which is exactly as those present in 12 grammes of carbon-12. Thus, the need to take their masses and volumes (if gaseous), to “the same base”. Since the substances that react contain different amounts of elementary particles (atoms, molecules, ions, electrons etc), which directly or indirectly contribute to their masses it is always difficult to measure the exact amount of a particular substance that may be required to react with another. This is known as the stoichiometry of the reaction, (i.e, the relationship between the amounts of the reactants and the products, in terms of the mole ratio and mass ratio of the species involved). ![]() Meaning that if we know the masses of A and B, we can easily calculate what we should be expecting as C.įor instance, in the reaction between sodium and chlorine to form sodium chloride įrom the above example, it means that whenever Na and Cl combine to form NaCl, they MUST do so in the ratio of 2:1:2 That is to say, 2 moles of Na molecule will always combine with 1 mole of Cl molecule to form 2 moles of NaCl molecule. In other words, all of A and B will be converted to C, assuming there is no loss. Then, the total masses of A and B will equal the mass of C. The above implies that if two substances A and B combine to give another substance C, i.e, This is also what was paraphrased in one of the postulations of Dalton’s Atomic Theory, which is, atoms are neither created nor destroyed (during a chemical reaction), but are changed from one form to another. It is the foundation of calculations in chemistry.Ĭhemical reactions, expressed as equations, are ways of confirming the Law of Conservation of Mass, which states that matter is neither created nor destroyed, but is transformed from one form to another. Mole concept is arguably the broadest topic in chemistry, as it cuts across every other branch of chemistry, as far as reactions are concerned. Before using this website, you must read our disclaimer here. ![]()
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