Mass Transfer
Reboiler is considered as one theoretical plate, because

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

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Mass Transfer
The McCabe Δ L law states that the

Molar heats of vaporisation of components are nearly equal
Linear crystal growth rate depends on the crystal size
Linear crystal growth rate depends on the degree of supersaturation
Linear crystal growth rate does not depend on the crystal size

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