Avogadro’s hypothesis:It states“Equal volumes of all the gases under similar conditions of the temperature and pressure contain equal number of molecules.” Avogadro hypothesis has been found to explain as stated below,
(i) It provides a method to determine the atomic weight of gaseous elements.
(ii)It provides a relationship between the vapour density (V.D.) and molecular masses of the substances.
Molecular mass = 2 * Vapour Density
(iii)It helps in determination of mass of fixed volume of a particular gas.
Mass of 1 ml gas = V.D.´0.0000897gm.
(iv)It also helps in the determination of molar volume at N.T.P.
V.D.´0.0000897gm.gas has the volume of = 1 ml
2 *V.D.(that is molecular mass)gmhas.png)
The molar mass of a gas or its 1 mole which occupies 22.4Lvolume at S.T.P.
(v) It helps in the determination of molecular formulae of gases and is quite useful in gas analysis. By knowing the molecular volumes of the reactants and products of reaction, the molecular composition of a matter can be determined quite easily.
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