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The '''empirical formula''' of a [[compound]] may not be the same as the [[Chemical Formula|chemical formula]]:
*Ethane
*Ethene
: [[Chemical Formula]]: C<sub>2</sub>H<sub>4</sub>
: The number of [[atom]]s can be found if you know the [[mass]] of different [[element]]s and the [[Relative Atomic Mass|relative atomic mass]] of the [[element]]s in the [[Chemical Reaction|reaction]].