### The Mole - What Is It?

here is a mole! =P

__Avogadro Number__**[A mole is defined as the amount of substance which contains the avogadro number of particles]**

and

[The avogadro number is defined as the number of atoms in 12g of the carbon-12 isotope]

**[ah, just remember that the avogadro number is**

__6.02 x 10^23__]=P

__Moles Of Atoms__also, the mass of one mole of atoms is its relative atomic mass in grams.

meaning that

**the relative atomic mass in grams of any element contains the same number of atoms : the avogadro number.**

in simpler terms,

**the number of atoms in 1 mole of any element, is 6.02 x 10^23.**

__Moles Of Molecules__in the same way,

the mass of one mole of molecules is its relative atomic mass in grams.

meaning that

**the relative molecular mass in grams of any compound contains the same number of molecules : the avogadro number.**

in simpler terms again, this means that

**the number of molecules in 1 mole of any compound, is 6.02 x 10^23.**

__Moles Of Gases__**[1 mole of gas at room temperature and pressure (r.t.p)**

occupies a volume of 24dm^3 (24000cm^3)]

occupies a volume of 24dm^3 (24000cm^3)]

this is called the molar gas volume as it contains the avogadro number of particles - 6.02 x 10^23.

always quote the temperature and pressure because both affect volume of gas.

the increase of temperature increases the volume,

if pressure increases, volume decreases.

**[equal volumes of all gases at same temperature and pressure contain the same number of particles]**

and therefore,

**[24dm^3 of all gases at same temperature and pressure contain the avogadro number of particles]**

for emphasis,

*in short,*

- a mole is a quantity of substance

**in grams**which

**contains the avogadro number of particles**

- the mass of 1 mole of atoms is its

**relative atomic mass in grams**

- the mass of 1 mole of molecules is its

**relative molecular mass in grams**

- 1 mole of any gas at r.t.p occupies a

**volume of 24dm^3**(24000cm^3)

- equal volumes of all gases at the same temperature and pressure

**contain the same number of particles**

chill-

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