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Modern’s ABC PLUS OF CHEMISTRY (E) Class XII Part I & II

Modern’s ABC PLUS OF CHEMISTRY (E) Class XII Part I & II is available to download free in pdf / epub format.

Modern’s ABC PLUS OF CHEMISTRY (E) Class XII Part I & II

Mole in Terms of Volume Mole is also related to the volume of the gaseous substance. Volume of one mole of any substance is called its molar volume. The molar volume of solids and liquids can be easily calculated if we know the molar mass and density at any given temperature and pressure because these do not change much with temperature and pressure. However, the molar volumes of gases change considerably with temperature and pressure. It has been observed that one mole of an ideal gas (i.e., 6.022 × 1023 molecules) occupies 22.4 litres at N.T.P. (0°C and 1 atm pressure). For example, 1 mole of hydrogen gas at N.T.P. = 22.4 litres 1 mole of CO2 gas at N.T.P. = 22.4 litres This provides us with a method to determine molecular masses (weights) of gases from experimentally determined density as Molecular mass = Molar volume × Density The summary of various relationships of mole may be illustrated as shown below :

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