Category : JEE Main & Advanced
The mole concept One mole of any substance contains a fixed number \[(6.022\times {{10}^{23}})\] of any type of particles (atoms or molecules or ions) and has a mass equal to the atomic or molecular weight, in grams. Thus it is correct to refer to a mole of helium, a mole of electrons, or a mole of \[N{{a}^{+}}\], meaning respectively Avogadro?s number of atoms, electrons or ions.
\[\therefore \] Number of moles \[=\frac{\text{Weight (grams)}}{\text{Weight of one mole (g/mole)}}\]
\[=\frac{\text{Weight}}{\text{Atomic or molecular weight}}\]
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