Question

Detail about mole concept

Answer 1

A chemical element is made up of very minute and indivisible particles called atoms.
mole is the SI unit for the amount of substance. One mole consists of 6.02*10^23 particles(atoms). Avogadro number- is the number of particles present in one mole and is equal to 6.02*10^23.
You can be asked to calculate the number of particles(protons, electrons)
n=N/NA
n-number of moles
N-Number of particles
NA-Avogadro s Constant

Relative Atomic Mass
Different atoms have different masses. Atoms have such a small mass it is more convenient to know their masses compared to each other. Carbon is taken as the standard atom and has a relative atomic mass (Ar) of 12.
Mg-24.0-1 mole-6.02*10^23 Mg particles
Na-23.0 1 mole-6.02*10^23 Na particles
O-16 1 mole-6.02*10^23 O particles
Cl-35.5 1 mol-6.02*10^23 Cl particles
Molar Mass(Mm) is the mass of 1 mole of a chemical substance. Unit is g/mol.
n=m/Mm
n-number of moles
m-mass of sample (g)
Mm- Molar Mass(g/mol)

Answer 2

First of all MOLE is same as that of the DOZEN(12) that is used in our daily life. It is used for comparison in Chemistry.

1 Mole is defined as the number or collection of 6.02 * 10^23 particles(atoms or Molecules).

Any chemical substance(Element or Compound) consists of 6.02 * 10^23 particles(atoms or molecules).

For example, 1 mole Sodium contains 6.02 * 10^23 number of sodium atoms.
similarly, 1 mole of water molecule consists of 6.02 * 10^23 number of water molecules.

Number of moles, n = N/NA ; NA = Avogadro's Constant = 6.02 * 10^23
Number of moles, n = m/M ; M = Molar Mass and m = Given Mass