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Mole Concept

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Concept of Mole – Learn What is Mole, Physical Quantities & Examples

Atom is the minutest particle of an element that can take part in a chemical reaction. It can exist independently.

A molecule is the most simple particle of the matter that is capable of independent existence. It can be homoatomic, e.g., H2, N2, CI2 (diatomic), O3 (triatomic) or heteroatomic, e.g., NH3, CH3, etc. 

When you are dealing with particles at an atomic or molecular level, even one gram of a pure substance is known to contain a large number of atoms.  It is where the mole concept is broadly used. It primarily emphasizes on the unit ‘mole’, which is a count of a very large number of particles.  Atoms and molecules are very small particles to count.  To solve this issue they are expressed in Avogadro’s number (NA = 6.023 x 1023) 

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Concept of gram atom, Concept of gram mole and Concept of gram equivalent

Chemical reactions involve interation of atoms and molecules. A large number of atoms // molecules ( approximately 6.023xx10^(23)) are present in a few grams of any chemical compound varying with their atomic // molecular masses. To handle such large numbers conveniently, the mole concept was introduced. This concept has implications in diverse areas such as analytical chemistry, biochemistry, electrochemistry, and radiochemistry. The following example illustrates a typical case, involving chemical // electrochemical reaction, which requires a clear understanding of the mole concept. A 4.0M aqueous solution of NaCl is prepared and 500mL of this solution is electrolyzed. This leads to the evolution of chlorine gas at one of the electrodes ( atomic mass of Na is 23 and Hg is 200)(1F=96500C) . The total number of moles of chlorine gas evolved is

Chemical reactions involve interaction of atoms and molecules. A large number of atoms and molecules (approximately 6.022 xx 10^(23) ) are present in a few grams of any chemical compound varying with their atomic/molecular masses. To handle such a large number conveniently, the mole concept was introduced. This concept has implications in diverse areas such as analytical chemistry, biochemistry, electrochemistry adn radiochemistry. The following examples illustrate a typical case involving chemical/electrochemical reaction which requires a clear understanding of mole concept. A 4.0 molar aqueous solution of NaCl is prepared and 500 mL of the solution is electrolysed. This lead to the evolution of chlorine gas at one of electrodes (atomis mass : Na = 23 , Hg = 200 , 1F = 96500 C) The total number of moles of chlorine gas evolved is :

Chemical reaction involve interaction of atoms and molecules. A large number of atoms/molecules (approximately 6.022xx10^(23) )are present in a few grams of any chemical compound varying with their atomic/molrcular mass. To handle such a large numbers conveniently, the mole concept was introduced. This concept has implications in diverse areas such as analytical in diverse areas such as analytical chemistry, biochemistry, electrochemistry and radiochemistry. The following example illustrates a typical case, involving chemical/ electrochemical reaction, which requires a clear understanding of the mole concept. A 4.0 molar aqueous solution of NaCl is prepared and 500 mL of this solution is electrolysed. This leads to the evolution of chlorine gas at one of teh electrodes (atomic mass: Na=23, Hg=200, 1F=96500 coulombs) The total number of moles of chlorine gas evolved is

Chemical reaction involve interaction of atoms and molecules. A large number of atoms/molecules (approximately 6.022xx10^(23) )are present in a few grams of any chemical compound varying with their atomic/molrcular mass. To handle such a large numbers conveniently, the mole concept was introduced. This concept has implications in diverse areas such as analytical in diverse areas such as analytical chemistry, biochemistry, electrochemistry and radiochemistry. The following example illustrates a typical case, involving chemical/ electrochemical reaction, which requires a clear understanding of the mole concept. A 4.0 molar aqueous solution of NaCl is prepared and 500 mL of this solution is electrolysed. This leads to the evolution of chlorine gas at one of teh electrodes (atomic mass: Na=23, Hg=200, 1F=96500 coulombs) If cathode is a Hg electrode, the maximum weight(g) of amalgam formed from the solution is