Question

Explain mole concept?

Answer 1

Mole concept expressing the amount of a substance, when we love to discuss small particles at atomic or molecular level. Then this mole concept is used. $1$ mole is the molecular mass in grams.

Complete step by step answer:
As we all have the mass in kilograms, grams and here we have to find moles of the substance.
Suppose we are taking an example of sodium chloride for explaining the number of molecules in one mole of substance. For this we have to know the atomic number and atomic mass of the atoms.
Chemical formula for, sodium chloride (salt) is $Nacl$
Atomic mass of $Na$ (sodium) $=23$
Atomic mass of $Cl$ (chlorine) $=35$ approx
The total molecular mass of $NaCl=23+35=58$ grams
Hence one mole of salt $=58$ grams
Now for the number of molecules present in one mole of the substance will
Number of molecules $=\dfrac{mass subs\tan ce}{massof\,1molecular}$
from above we have number of salt molecule $=\dfrac{58gm}{58\times 14Atom}$
$=\dfrac{58g}{58\times 1.67\times {{10}^{-24}}gm}$
$=6.022\times {{10}^{23}}$ molecules.
So above we have an example of sodium chloride molecules present in one mole of substance.
from the above calculation or the basic formula for finding the number of molecules present in one mole of substance will always be $6.02\times {{10}^{23}}$ molecules. This is also known as Avegadro’s number.

Note: Above we leave an example of solid material same we can do with gases and liquid species only we have to multiply the number of moles with Avogadro's number for getting how many moles you want to get.