Question: I have no idea what the right answer is, I tried to do a mass balance but I apparently didn't do it correctly, any tips?

I have no idea what the right answer is, I tried to do a mass balance but I apparently didn't do it correctly, any tips? Thanks!
The separation of aromatic compounds from paraffins is essential in producing many polyesters that are used in a variety of products. When such compounds have the same number of carbon atoms they often have similar vapor pressures, which makes it difficult to separate them by distillation. Extraction is a viable altemative as illustrated by the following simple system. Sulfolane (an industrial solvent) and octane may be considered completely immiscible. At 25C, the ratio of the mass fraction of xylene in the octane-rich phase to the mass fraction of xylene in the solfolane-rich phase is 0.250 One hundred kg of pure sulfolane are added to 130.0kg of a mixture containing 60.0wt% octane and 40.0% xylene, and the resulting system is allowed to equilibrate. How much xy lene transfers to the sulfolane phase? kg
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