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I think it is more significant that gases effect activity (which is a concept that is a little more complicated so Dr. Lavelle said we don’t need to really focus on it) and activity is how equilibrium constants are found so therefore gases explain equilibrium constants.
Pure substances can't be separated into other substances. Air for example is a mixture of different gases so it is not 'pure'. Pure substances are also made of the same material throughout so a solid and liquid are physically the same throughout I believe.
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