The boiling point of pure Benzene is 80.1 °C. When 20.97 g of an unknown solid are added to 250.0 mL of Benzene the solution is raised to 83.04°C . Given that the ebullioscopic constant (Kb) is 2.53 °C/molal, what is the molar mass of the unknown solid? (dbenzene = 0.876 g/mL)

Compared with the freezing-point depression of a 0.01 m c6h12o6 solution, the freezing-point depression of a 0.01 m nacl solution is

In a heat of an engine, if 700 j enters the system, and the piston does 400 j of work what is the final internal (thermal) energy of the system if the initial energy is 1,500 j

Consider a culture medium on which only gram-positive organisms such as staphylococcus aureus colonies can grow due to an elevated nacl level. a yellow halo surrounds the growth, indicating the bacterium fermented a sugar in the medium, decreasing the ph as a result and changing the color of a ph indicator chemical. this type of medium would be referred to as a differential and enrichment culture.