Question

How can i solve mole concept easily ?

Answer 1

you can solve easily by mole formula

Answer 2

You are aware of the measure words dozen, pair, right?Just like that mole is a measure word of mentioning no. of atoms

If you take a molecule of an element you will be having billions of atoms in it which is nearly impossible to write  all that all the time during calculations. So for our  ease to do calculations we convert the very large numbers(no. of atoms) into a smaller quantity called moles

1 mole of a substance = molecular mass = 6.022* 10 ^23 atoms = 22.4l at STP

Always remember this when calculating moles

Let me take some examples to explain this,

If you take 1 mole of Sodium in a container and weigh it, you will be always getting the same value that is 23 u( molecular mass of sodium)

likewise, 1 mole of aluminium always weigh 27g  and so on

So, we can say 1 mole = molecular mass of substance

If you take 1 mole of sodium and count the no.of atoms in it , at any cases you will be getting only 6.022 * 10^23 atoms

same  if you take 35.5 g of Chlorine or 1 mole of Cl you will only be getting 6.022*10^23 atoms and so on

So we can also say 1 mole of a substance has 6.022*10^23 atoms ALWAYS

If you take 1 mole of Oxygen(or any gas) and find the volume occupied by it, you will always find the volume to be 22.4L at STP only(Standard temperature and Pressure. Std temp = 0°C & std pressure = 760mm of Hg)

Like wise if you take 1u of Hydrogen it will always occupy  22.4L and so on

1mole of a substance = 22.4l of volume at STP

At first mole concept might sound confusing but with daily practise you can do these problems with no effort!

Hope it is clear!