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===Molar Gas Volume and Mass===
: At [[Standard Temperature and Pressure]] (20°C and 101,000Pa) the [[Volume (Space)|volume]] of one [[mole]] of [[gas]] is 24 dm<sup>3</sup>.
: The [[Volume (Space)|volume]] of [[gas]] required or [[product|produced]] in a [[Chemical Reaction|chemical reaction]] can be calculated from the [[mass]] of the [[gas]] and its [[Relative Formula Mass]].