Question

1. Carbon tetrachloride, CCl4, has a vapor pressure of 213 torr at 40 °C and 836 torr at 80 °C. What is the normal boiling point of CCl4? 2. Pressure cookers allow food to cook faster because the higher pressure inside the pressure cooker increases the boiling temperature of water. A particular pressure cooker has a safety valve that is set to vent steam if the pressure exceeds 3.4 atm. What is the approximate maximum temperature that can be reached inside this pressure cooker? Explain your reasoning. 3. In flushing and cleaning columns used in liquid chromatography to remove adsorbed contaminants a series of solvents is used. Hexane (C6H14), chloroform (CHCl3), methanol (CH30H), and water are passed through the column in that order. Rationalize the order in terms of intermolecular forces an the mutual solubility (miscibility) of the solvents. 4. The high melting points of ionic solids indicate that a lot of energy must be supplied to separate th rom one another. How is it possible that the ions can separate from one another when solub ions f are dissolved in water, often with essentially no temperature change?

Answer 1