CHEMICAL FORMULAE AND EQUATIONS

A.RELATIVE ATOMIC MASS AND RELATIVE MOLECULAR MASS



RELATIVE ATOMIC MASS:The average mass of one atom of the element when compare

with 1/12 of the mass of an atom carbon-12.

RELATIVE MOLECULAR MASS: The average mass of the molecule when compared with

1/12 of the mass of one atom of carbon-12



B.THE MOLE AND THE NUMBER OF PARTICLES



What is a mole?

:A mole is an amount of substance that contains as many particles as the number of atoms in exactly 12g of carbon-12.

Avogadro Constant: the number of particles in one mole of a substance.

: one mole of substances contain 6.02*10^23 particles.



C.THE MOLE AND THE MASS OF SUBSTANCES


:The mass of one mole of any substances is called its molar mass
:The value of molar mass of an element is equal to its relative atomic mass.





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