Amount of a substance 2.1-2.6

Relative atomic mass --> the ratio of the average mass of one atom of an element to one twelth of the mass of an atom of carbon-12 

Relative molecular mass--> the ratio of the average mass of one molecule to one twelth of the mass of an atom of carbon-12 

A mole of an element is defined as the number of atoms 

Number of particles= number of moles X Avo number 

Mass= Mr X mole 

Number of moles= concentration X volume 

percentage yeild= actual yeild

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