Problem 14
a. What is sublimation? b. Give two examples of common substances that sublime at ordinary temperatures.
Problem 15
What is meant by the normal freezing point of a substance?
Problem 16
Explain how the attractive forces between the particles in a liquid are related to the equilibrium vapor pressure of that liquid.
Problem 17
Explain the relationship between atmospheric pressure and the actual boiling point of a liquid.
Problem 18
Explain the relationship between the molar enthalpy of fusion of a solid and the strength of attraction between that solid’s particles.
Problem 19
a. The molar enthalpy of vaporization for water is 40.79 \(\mathrm{kJ} / \mathrm{mol}\) . Express this enthalpy of vaporization in joules per gram. b. The molar enthalpy of fusion for water is 6.009 \(\mathrm{kJ} / \mathrm{mol}\) . Express this enthalpy of fusion in joules per gram.
Problem 20
Calculate the molar enthalpy of vaporization of a substance, given that 0.433 mol of the substance absorbs 36.5 kJ of energy when it is vaporized.
Problem 22
a. Calculate the number of moles in a liquid sample of a substance that has a molar enthalpy of fusion of 3.811 \(\mathrm{kJ} / \mathrm{mol}\) , given that the sample releases 83.2 kJ when it freezes. b. Calculate the molar mass of this substance if the mass of the sample is 5519 \(\mathrm{g}\) .
Problem 23
Describe the structure of a water molecule.
Problem 24
List at least eight physical properties of water.
