I am not sure what you mean by your question but I will
try to answer the best I can.
A mole is unit used for
counting lots and lots of things. A "dozen" is a similar concept to a mole. A dozen
donuts = 12 donuts. We count many donuts using "dozens". Similarly a mole represents a
large number of objects (usually atoms, ions, molecules or other
particles).
The value of one mole is 6.02 x 10^23 things.
That is 602 plus 21 more zeros. It is a huge
number.
Chemists use the mole because it is important that
we know NUMBERS of particles in chemical equations. Because these numbers are so LARGE,
we use the mole to express them.
With regards to your
question, chemists use moles to measure the number of atoms/molecules/ions/particles
in
1. a solid sample of pure substance (like a block of
copper, or pile of salt)
2. the amount of substance in a
solution (like salt dissolved in water)
3. a container
filled with gas
more on the mole at href="http://www.chemistryexplained.com/Ma-Na/Mole-Concept.html">http://www.chemistryexplained.com/Ma-Na/Mole-Concept.html
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