The Brainliest Answer!
Mole   is the mass of the substance divided by its molecular mass.  It can also be the number if molecules of the given substance divided by the avagadro number which is 6.023X10^23. If u get a question define mole in your test
then just simply write this answer!!

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how we find the number of molecules in CaCO3
u should know the mass first
after knowing mass what we should do?
divide the mass by the molecular mass and multiply the ans. by the avagadro's number
no of molecules=(mass/molecular mass)*avogadro number