The Mole Concept
The Mole Concept
Mole Concept:
Wilhelm Ostwald introduced the term ‘mole’ in 1896, which was accepted as unit to represent a large quantity of atoms in 1967. The mole is the amount of a substance which contains as many particles (atoms, ions, molecules, formula unit etc.) as in 12gm of C-12. Thus, one mole of any species is that quantity in number having a mass equal to its atomic or molecular mass in grams.
The number of particles present in 1 mole of any substance is same and fixed which is equal to . This is a constant, known as Avogadro constant or Avogadro number (
) named in the honour of Italian scientist Amedeo Avogadro. Thus, mole is also defined as number of particles equal to the Avogadro constant.
________________________ named in the honour of Italian scientist Amedeo Avogadro. | |||
| Right Option : D | |||
| View Explanation | |||
Which of the following are correct : (a) 1 mole of sodium is equals to 23 g. (b) 1 mole of chlorine is equals to 35.5 g. | |||
| Right Option : C | |||
| View Explanation | |||
Which of the following are correct : (a) The number of particles present in 1 mole of any substance is same and fixed which is equal to (b) Mole is also defined as number of particles equal to the Avogadro constant. | |||
| Right Option : C | |||
| View Explanation | |||
Students / Parents Reviews [10]
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