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==Key Stage 4==
===Meaning===
The '''relative formula mass''' ('''M<sub>r</sub>''') of a [[molecule]] is the [[mass]] of one [[mole]] of ([[Avagadro Constant|6.02x10<sup>23</sup>]]) of [[molecule]]s.
===About Relative Formula Mass===
: '''Relative formula mass''' can be calculated from the [[Chemical Formula|chemical formula]] of the [[molecule]] and the [[Relative Atomic Mass|relative atomic mass]] of the [[element]]s.
: The '''relative formula mass''' is used to find the [[mass]] of a [[molecule]] needed to perform a complete [[Chemical Reaction|reaction]] with another [[chemical]].