Is vapor pressure an intensive or extensive of a property volatile substance? Us

Question

Is vapor pressure an intensive or extensive of a property volatile substance? Use a Born-Haber cycle to calculate the lattice energy of potassium chloride (KCl) from the following data: lonization energy of K(g) = 419 kJ/mol Electron affinity of Cl(g) = -349 kJ/mol Energy to sublime K(s) = 89 kJ/mol Bond energy of Cl_2(g) = 243 kJ/mol Standard heat of formation of KCl = -436.5 kJ/mol. Calculate the lattice energy of sodium oxide (Na_2O) from the following data: Ionization energy of Na(g) = 495 kJ/mol Electron affinity of O(g) for 2 electrons = 603 kJ/mol Energy to sublime Na(s) = 109 kJ/mol Bond energy of O_2(g) = 498 kJ/mol Delta H_rxm for 2 Na(s) + 1/2 O_2(g) rightarrow Na_2O(s) = -416 kJ/mol Rank the following compounds in order of increasing vapor pressure at 298 K: CH_3CH_2OH, CH_3OCH_3, and CH_3CH_2CH_3. Rank the compounds in Figure P11.16 in order of increasing vapor pressure at 298 K.

Explanation / Answer

11.16 The answer is c < b < a

c has the lowest vapour pressure and a has the highest.

The higher the vapor pressure of a liquid at a given temperature, the higher the volatility and the lower the normal boiling point of the liquid. Or compounds with lower boiling point will have higher vapour pressure.

BP of cyclopropane = -33 °C

BP of cyclobutane = 12.5 °C

BP of cyclopropane = 49.2 °C

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