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Illustrate that for correct mass balance, relative amounts of two co-existing phases or microconstituents must be given by lever principle.
Ans: Using lever rule one can conclude quantitatively the relative composition of a mixture in a two-phase region in a phase diagram. Distances l from the mixture point along a horizontal tie line to both phase boundaries gives the composition:
Nαlα= Nβlβ
Nα signifies the amount of phase α and Nβ represents the amount of phase β.
It can be conveniently expressed as:
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