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M3.  REACTING GAS-VOLUME STOICHIOMETRY PROBLEMS USING V µ n 

 M3.1  CALCULATING GAS VOLUME, V, FROM A STOICHIOMETRIC RELATIONSHIP 

WORKED EXAMPLE 4

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It should prove useful to many seeing the consolidated working for this last problem but without any commentary.

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Points to ponder

  • Arguably, problems like that above represent the easiest of the stoichiometry questions likely to be encountered.  It should not be forgotten, however, that the straightforward procedure relies on the proportionality of chemical amount to gas volume.

  • Facile solutions are generally based either on stoichiometric or excess amounts of oxygen or air where combustion is concerned.

  • In the problem above, the volume of liquid water, H2O(ℓ), produced is negligible
    - i.e., virtually zero - as it is a condensed phase.

  • Liquid phases, when they change to the gaseous state at the same temperature, typically undergo an expansion of between 1000 – 10 000 x.

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