At 30C, the amounts of acetone absorbed at partial pressures of 10 and 100 mm Hg are 0.1 and 0.4 kg acetone/kg activated carbon, respectively. Assume Langmuir isotherm describes the adsorption of acetone on activated carbon. What is the amount of acetone adsorbed (in kg per kg of activated carbon) at a partial pressure of 50 mm Hg and 30C?