Molar volume is commonly quoted as at STP ( and ).

CHEMISTRY · Multi-part · A Level · Chemistry · Amount of substance · Amount of substance

Problem

Molar volume is commonly quoted as 22.4 L22.4\,\text{L} at STP (0∘C0^{\circ}\text{C} and 1 atm1\,\text{atm}). (a) State the numerical values of standard temperature and standard pressure used in this definition. (b) Explain qualitatively why the molar volume of an ideal gas changes when either the chosen standard temperature or standard pressure is altered. (c) Calculate the molar volume of an ideal gas at 25∘C25^{\circ}\text{C} and 1 bar1\,\text{bar} (1 bar=1.00×105 Pa1\,\text{bar}=1.00\times10^{5}\,\text{Pa}).

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