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Answer:
The mole concept is a convenient method of expressing the amount of a substance.
In the field of chemistry, a mole is defined as the amount of a substance that contains exactly 6.02214076*10^23 ‘elementary entities’ of the given substance.
#The number 6.02214076*10^23 is popularly known as the Avogadro constant and is often denoted by the symbol ‘NA’.
#elementary entities can can be atoms, molecules, monoatomic/polyatomic ions, and other particles (such as electrons).
#one mole of a pure carbon-12 (12C) sample will have a mass of exactly 12 grams and will contain 6.02214076*1023 (NA) number of 12C atoms.
#n = N/NA , n is the number of moles of the substance
N is the total number of elementary entities in the sample
NA is the Avogadro constant.
ATOMIC MASS
The atomic mass of an element is the mass of one atom of the element expressed in atomic mass units (amu). It accounts for the abundance of the various isotopes of the element and assigns an average value to the mass of one atom of the element.
#The atomic mass of an element is roughly equal to the sum of all the protons and neutrons present in its nucleus.
MOLECULAR MASS
The molecular mass of an element is the sum of the atomic masses of all its constituent elements.
#the molecular mass of water is equal to the sum of the atomic masses of its constituents – hydrogen and oxygen.The atomic mass of hydrogen is 1 amu and that of oxygen is 16 Since water molecules contain 2 hydrogen atoms and only one oxygen atom, the molecular mass of H2O is 18 amu.
MOLAR MASS
The molar mass of a substance is defined as the total mass of one mole of the substance. It is often represented in terms of ‘grams per mole’ (g/mol).
#SI unit :kg/mol
#Molar mass of a Substance = (Mass of the Substance in grams)/(Number of Moles)
GRAM ATOMIC MASS
The gram atomic mass of an element is the mass of one mole of that element.
GRAM MOLECULAR MASS
The gram molecular mass of a compound refers to the mass of a single mole of the compound.