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Question

What is the volume of a gas at RTP and STP?


Solution

We also utilize the latest RTP and STP from IUPAC.

RTP : $$ 25^0 C $$ and $$ 1  bar $$ just like for the thermodynamic standard state
STP : $$ 0^0 C $$ and $$ 1 bar $$ after 1982
and thus its MOLAR volume is given  by

$$ \bar {V}^{id}_{RTP} = \frac {RT_{RTP}}{P} $$

            $$ = \dfrac {( 0.083145 L . bar /mol .K)(298.15K) }{ 1 bar } $$

            $$ = 24.790 L /mol $$
or 

$$ \bar {V}^{id}_{RTP} = \frac {RT_{RTP}}{P} $$

            $$ = \dfrac {( 0.083145 L . bar /mol .K)(273.15K) }{ 1 bar } $$

            $$ = \frac { 273.15}{298.15} \bar {V}^{id}_{RTP} $$

            $$ = 22.711 L /mol $$

Chemistry

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