Question

The number of atoms in one mole of a substance is equal to ................ ?

• A. Avagadro number
• B. Mass number
• C. Both (a) and (b) above
• D. Density

Answer 1

Answer: (A)

Avagadro number

Avagadro's number is the number of units in one mole of any substance, equal to $6.023\times {10}^{23}$. The units may be electrons, ions or molecules depending on nature of the substance & character of the relation.

$\Rightarrow$ If one mole$=[6.023\times {10}^{23}]$, then number of atoms is Avagadro's number.