When a 49.1-g sample of an unknown compound is dissolved in 500.g of benzene, the freezing point of the resulting solution is 3.77°C. The freezing point of pure benzene is 5.48°C and Kf for benzene is 5.12°C/m. Calculate the molar mass of the unknown compound.

The process of condensation happens when which of the following occurs?

If 2.00 g of helium gas and 3.82 g of oxygen gas are mixed together, what is the mole fraction of helium in the solution?

A liquid-liquid solution is called an ideal solution if:I.It obeys PV = nRT.II.It obeys Raoult’s law.III.Solute-solute, solvent-solvent, and solute-solvent interactions are very similar.IV.Solute-solute, solvent-solvent, and solute-solvent interactions are quite different.

The elements of group 5A, the nitrogen family, form compounds with hydrogen having the boiling points listed below:          SbH3 –17°C,  AsH3 –55°C,  PH3 –87°C,  NH3 –33°CThe first three compounds illustrate a trend where the boiling point decreases as the mass decreases; however, ammonia (NH3) does not follow the trend because of

Determine the osmotic pressure of a solution that contains 0.048 g of a hydrocarbon solute (molar mass = 340 g/mol) dissolved in benzene to make a 350-mL solution. The temperature is 20.0°C.

When 92.0 g of a compound is dissolved in 1000. g of water, the freezing point of the solution is lowered to –3.72°C. Determine the molar mass of the compound.

Polyethylene is a synthetic polymer or plastic with many uses. 1.36 g of a polyethylene sample was dissolved in enough benzene to make 100. mL of solution, and the osmotic pressure was found to be 1.86 torr at 25oC. What is the approximate molar mass of the polyethylene?

Assume 12,500 J of energy is removed from 36 grams of H2O at 115°C. a)  What is the state of the H2O after the energy is removed? b)  What is the final temperature of the H2O? c)  Draw a phase diagram for this process.  Identify where the start and end points are on the diagram.  

Calculate the osmotic pressure (in torr) of 6.00 L of an aqueous 0.958 M solution at 30.°C, if the solute concerned is totally ionized into three ions (e.g., it could be Na2SO4 or MgCl2).