How many moles of ions (particles) are present in 1.0 L of 0.5 M Li2SO4 (lithium sulfate)?

The following partial phase diagram shows a close-up view of the vapor pressure curves (liquid-vapor equilibrium curve) for a pure solvent and a solution containing a nonvolatile solute dissolved in this solvent. Which curve is the solvent and what happens to the boiling point when the solute is dissolved in the solvent?

The enthalpy of vaporization for ethanol is 39.3 kJ/mol.  The vapor pressue for ethanol at 34.9 oC is 100 mmHg.  What is the normal boiling point of ethanol if the atmospheric pressure is 740 mm Hg.  Show your work to receive credit. You can use the Clausius-Clayperon 2-point equation:

Which best indicates the direction of the dipole moment in formaldehyde, H2C=O?  

African-Americans were represented at every level of government.

A solution of I2 is needed for an experiment and the following solvents are available. Which is the best solvent for I2 CH3OH, H2O, CCl4, CH2Cl2

Which of the following terms refers to the resistance of a liquid spread?

From the following list of aqueous solutions , select the one with the highest boiling point . [Boiling point of water is 100.0 oC, Kb for water is 0.51 and ΔTb = Kb * m * i ]

Determine the vapor pressure of a solution at 55°C that contains 34.2 g NaCl in 375 mL of water. The vapor pressure of pure water at 55°C is 118.1 torr. The van’t Hoff factor for NaCl is 1.9. [Psolution = Xsolvent * Psolvent]

Which of the following statements describe the correct method of preparation of 1.00 L of a 3.0 m (molal) urea solution? (molar mass of urea = 60.06 g/mol)