Mass Transfer
Reboiler is considered as one theoretical plate, because

None of these
Reboiler itself contains one plate
Vapour is recycled to the column
Of the assumption that vapour and liquid leaving the reboiler are in equilibrium

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Mass Transfer
An example of elutioh is

Separation of uranium oxide from its ore by H₂SO₄ in a Pachuca tank
Dissolution of tannin out of tree barks by water
Separation of sugar from sugar beet by hot water
Recovery of vegetable oils from seeds

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