Question

how to calculate mole of any atom

Answer 1

1) if u r provided with a sample having mass 'm' consisting the atoms or molecules . then to calculate number of moles u have to just divide the given mass by the Gram atomic mass (in case when the sample consisting of a particular type of atoms) or Gram molecular mass ( in case when the sample consisting of a particular type of molecules). It is represented below :
number of moles = (given mass) /( Gram atomic mass.)
or for molecules consisting sample:
= (given mass)/ (Gram Molecular mass)
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2) if u r provided with no of atoms or molecules present .Then divide the given number by Avogadro's number. It is represented below:
no of moles =( given number of atoms or molecules )/ (Avogadro's number)
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3) (This method has to be applied at STP /NTP conditions for gases )
if u r provided with volume of a particular gas . if it is in Litre then just divide the given volume by 22.4 .
It is because one moles of all gases at STP has 22.4 litre volume.
no of moles : (vol of gas in litres)/22.4

Answer 2

1.You can calculate No : of moles by dividing the given mass by molar mass
For eg:
Find the no: of moles in 22 g of CO₂.
Ans : No : of moles = Given mass / Molar mass 
                               = 22 /  44 = 0.5 moles.

2.Yo can calculate No : of moles by  dividing the  given no: of  particles by Avogadro no :
For eg:
Find the no: of moles when the no: particles (no: of particles can be atoms or molecules) is 12.044 × 10 ²³.
Ans : no: of moles =  given no: of  particles ÷  Avogadro no :
                             = 12.044 × 10 ²³ ÷ 6.022 ×10 ²³ = 2 moles

3.We can also calculate the no : of moles by dividing GIVEN VOLUME BY MOLAR VOLUME. Molar Volume is fixed with a value of 22.4 liters

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