Two beakers are places in a closed container, beaker A initially contains 0.15 mole of naphthalene (C10H8) in 100g benzene (c6h6), as well as beaker B contains 31g of unknown compound dissolved in 100g benzene. At equilibrium, beaker A lost 7.0g. Presume ideal behavior compute the molar mass of the unknown compound. State any assumptions made.