need help with this question, please explain in details. thank you

A sealed box consists of a pool of benzene, 5L of water, and 1 gram of activated carbon (there is no gas phase) - see figure on the right. You may assume that the activated carbon stays in the water phase. The system is allowed to equilibrate at standard temperature and pressure. The adsorption of benzene on this carbon follows the Freundlch isotherm with parameters from Table 3.B.5 in your book. What is the minimum mass of benzene that must have been added to the box so that some liquid benzene still remains as an immiscible phase. You can neglect biological and chemical degradation. Table 3.B.5 Freundlich Sorption Isotherm Parameters for Selected Organic Compounds in Water on Activated Corhan