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3.

Calculate the entropy change (J/mole.K) of the reaction. The molar entropies [S] are given in brackets after each substance.

2 CuS(s) [66.5] + 3 O2(g) [205.1]" 2 CuO(s) [42.6] + 2 SO2(g) [248.2]

4.

Calculate the entropy change (J/mole.K) of the reaction. The molar entropies [S] are given in brackets after each substance.

3 NO2(g) [240.1] + H2O(l) [69.9] " 2 HNO3(aq) [146.4] + NO(g) [210.8]

5.

Given Sº = -266.3 and the listed [Sº values] calculate Sº for Fe3O4(s).

4 Fe3O4(s) [____] + O2(g) [205.1] " 6 Fe2O3(s) [87.4]

6.

Given Sº = -114.3 and the listed [Sº values] calculate Sº for CCl4(g).

CH4(g) [186.3] + 4 Cl2(g) [223.0] " CCl4(g) [____] + 4 HCl(g) [186.9]

7.

Predict which of the following reactions has a negative entropy change.

                                                              I.      2 SO2(g) + O2(g) " 2 SO3(g)

                                                           II.      MgO(s) + CO2(g) " MgCO3(s)

                                                         III.      PCl5(s)  " PCl3(l) + Cl2(g)

8.

Predict which of the following reactions has a positive entropy change.

                    I.      Ag+(aq) + Cl-(aq) " AgCl(s)

                 II.      NH4Cl(s)  " NH3(g) + HCl(g)

               III.      2 NH3(g) " N2(g) + 3 H2(g)

9.

The enthalpy and entropy change of a reaction are -6.1 kJ/mole and +38.9 J/mole K respectively at 25ºC. What is the free energy change in kJ/mole?

10.

The enthalpy and entropy change of a reaction are -26.1 kJ/mole and +3.89 J/mole K respectively at 25ºC. What is the free energy change in kJ/mole?

11.

Using the listed information calculate Kp at 25ºC.

Ag2O(s) " 2 Ag(s) + 1/2 O2(g)

Hºf (kJ/mole) -31.0, 0.0, 0.0

Sº (J/K.mole) 121.3, 42.6, 205.1

12.

Nitrosyl chloride decomposes by the following reaction with Hº = -51.7 kJ/mole and Sº = 48.2 J/mole.K. Estimate Kp at 100ºC.

NOCl(g) " 1/2 N2(g) + 1/2 O2(g) + 1/2 Cl2(g)

13.

Using the listed information calculate the temperature (C) where Kp = 1.0.

Ag2O(s) " 2 Ag(s) + 1/2 O2(g)

Hºf (kJ/mole) -31.0, 0.0, 0.0

Sº (J/K.mole) 121.3, 42.6, 205.1

14.

Using the listed [deltaGºf values] calculate delta G for the reaction:

4 NH3(g) [-16.5] + 5 O2(g) [0.0] " 4 NO(g) [+86.6] + 6 H2O(g) [-228.6]

15.

Using the listed [[delta Gºf values] calculate delta G for the reaction:

4 FeS2(s) [-166.7] + 11 O2(g) [0.0]  " 2 Fe2O3(s) [-740.9] + 8 SO2(g) [-300.3]

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