Chapter 17: Q77E (page 733)
What is ion-pairing?
Ion pairing is the tendency of ions present in the electrolytes to attract the opposite charge towards itself.
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The lattice energy of NaI is -686 kJ/mol, and the enthalpy of hydration is -694 kJ/mol. Calculate the enthalpy of solution per mole of solid NaI. Describe the process to which this enthalpy change applies.
You have a solution of two volatile liquids, A and B (assume ideal behavior). Pure liquid A has a vapor pressure of 350.0 torr and pure liquid B has a vapor pressure of 100.0 torr at the temperature of the solution. The vapor at equilibrium above the solution has double the mole fraction of substance A as the solution does. What is the mole fraction of liquid A in the solution?
Determine the molarity and mole fraction of a 1.00 m solution of acetone (CH3COCH3) dissolved in ethanol (C2H5OH). (Density of acetone = ; density of ethanol = .) Assume that the final volume equals the sum of the volumes of acetone and ethanol.
Carbon tetrachloride (CCl4) and benzene (C6H6) form ideal solutions. Consider an equimolar solution of CCl4 and C6H6 at 25 หC. The vapor above the solution is collected and condensed. Using the following data, determine
the composition in mole fraction of the condensed vapor.
Substance ฮGหf
C6H6(l) 124.50 kJ/mol
C6H6(g) 129.66 kJ/mol
CCl4(l) 265.21 kJ/mol
CCl4(g) 260.59 kJ/mol
Although Al(OH)3is insoluble in water but NaOH is very soluble. Explain the difference in terms of lattice energy.
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