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==Key Stage 4==
===Meaning===
The '''Avagadro Constant''' is the number of [[atom]]s in 12g of [[Carbon]]. '''6.02x10<sup>23</sup> ''' [[atom]]s per mol.
===About the Avagadro Constant===
: The '''Avagadro Constant''' is used to state the number of [[atom]]s or [[molecule]]s in a [[mole]] of a [[substance]].
: The '''Avagadro Constant''' is normally written in [[Standard Form]].
: '''6.02x10<sup>23</sup> ''' = '''602,000,000,000,000,000,000,000''' correct to 3 [[Significant Figures]].: 1 [[mole]] of an [[element]] contains '''6.02x10<sup>23</sup> ''' [[atom]]s of that [[element]].: 1 [[mole]] of a [[molecule]] contains '''6.02x10<sup>23</sup> ''' [[molecule]]s.