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Apply the Gibbs phase rule to the following situations.

Hydrocarbon Absorption

An air stream with small amounts of hydrocarbons is to be treated in an adsorption process to reduce the amount of volatile hydrocarbon in the air stream. At the exit of the separation process, the solid sorbent is in equilibrium with a vapor stream that contains air and four hydrocarbons.

How many intensive variables need to be specified to reduce the degrees of freedom to zero?

You may take air to be one component.

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