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General Chemistry and Thermodynamics

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7.5. Given the following table of thermodynamic data,
substance ΔHf° S°

POCl3 (g) -542.2 kJ/mol 325 J/mol - K
POCl3 (l) -597.0 222

determine the normal boiling point (in °C) of POCl3.

a. 133.0
b. 532
c. 273.3
d. 259
e. 308.3

7.6 Which one of the following reactions would have a positive value for ΔS°?

a. Ba(OH)2(s) + CO2(g)  BaCO3(s) + H2O(l)
b. N2(g) + 3H2(g)  2NH3(g)
c. AgNO3(aq) + HCl(aq)  AgCl(s) + HNO3(aq)
d. 2SO3(g)  2SO2(g) + O2(g)
e. freezing water to form ice

7.7 Which one of the following processes results in a decrease of the entropy of the system?

a. dissolving oxygen in water
b. explosion of nitroglycerine
c. sublimation of naphthalene
d. boiling of alcohol
e. dissolving sodium chloride in water

7.8 Which one of the following processes results in a decrease of the entropy of the system?

a. dissolving oxygen in water
b. explosion of nitroglycerine
c. sublimation of naphthalene
d. boiling of alcohol
e. dissolving sodium chloride in water

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Solution Summary

This solution addresses the questions on general chemistry and thermodynamics by identifying the correct answer and providing a clear explanation why.

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