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Physical Chemistry

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"Liquids A and B, which have identical molar volumes, are mixed together in equal volumes to form a 75 mL mixture. The liquids are partially miscible and the mixture phase separates into an upper phase with a composition xA=0.45 and a lower phase with a composition xA=0.82. How many milliliters of each phase forms? What will happen if another 25 mL of liquid B were added to the mixture?"
I know that I need to use the lever rule, and the V(total)=V(a)n(a)+V(b)n(b)
I am 100% convinced I am over thinking this, but are the n(a) the same as n(alpha) in the lever rule?

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