General Chemistry 4th. Edition by Donald A. McQuarrie, Peter A. Rock, Ethan B. Gallogly | 9781891389603 | 1891389602 | Holooly

General Chemistry

General Chemistry

313 SOLVED PROBLEMS

Question: 25.11

A schematic diagram for a methane-oxygen fuel cell is shown in Figure 25.15. The equations for the half-cell reactions are given below. Anode: CH4(g) + 2 H2O(l) → CO2(g) + 8 H^+(aq) + 8 e^– Cathode: 2 O2(g) + 8 H^+(aq) + 8 e^– → 4 H2O(l) / Overall: CH4(g) + 2 O2(g) → CO2(g) + 2 H2O(l) Use the ...

Verified Answer:

\Delta G^{\circ}_{rxn} =\Delta G^{\circ}_{f...

Question: 24.3

Determine the number of valence electrons for the vanadium atom in the vanadate ion, VO3^–, and write its Lewis formula. Use VSEPR theory to predict its shape. ...

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The oxidation state of the vanadium atom in the va...

Question: 23.10

Will the reaction described by the equation CO(g, 0.010 bar) + 2 H2(g, 0.010 bar) → CH3OH(l) occur spontaneously at 25°C? ...

Verified Answer:

We first use Table 23.1 to calculate

ΔG^{\c...

Question: 22.8

Suppose we mix 50.0 mL of 1.00 × 10^−2 M AgNO3(aq) with 100.0 mL of 2.00 × 10^−4 M K2CrO4(aq) at 25°C. Does Ag2CrO4(s) precipitate from the solution? If yes, then calculate how many millimoles of Ag2CrO4(s) precipitate. ...

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The chemical equation for the precipitation reacti...

Question: 14.8

Use the ΔH°f data in Table 14.3 to calculate the value of ΔH°rxn for the combustion of ethanol, CH3CH2OH(l), at 25°C, described by the chemical equation CH3CH2OH(l) + 3 O2(g) → 2CO2(g) + 3 H2O(l) ...

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Referring to Tables 14.2 and 14.3, we find that [l...

Question: 14.15

A 1.000-gram sample of octane, C8H18(l), is burned in a calorimeter like that shown in Figure 14.18, and the observed temperature increase is 1.679 K. The total heat capacity of the calorimeter is cV,cal = 28.46 kJ·K^–1 (where we write cV,cal to emphasize that the value of the heat capacity of the ...

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(a) The equation for the combustion reaction is [l...

Question: 25.9

Write out the cell equation for the cell Fe(s)|Fe^2+(aq, 0.100 M)||Fe^2+(aq, 2.00 M)|Fe(s) Calculate the voltage generated by this “concentration cell” at 25.0°C. Why do you think this cell is called a concentration cell? ...

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The two half reactions and the corresponding value...

Question: 25.8

Use the data in Table 25.3 to determine whether Co^3+(aq), a fairly strong oxidizing agent, is capable of oxidizing water to O2(g) in acidic aqueous solution under standard conditions at 25.0°C, according to the equation 4 Co^3+(aq) + 2 H2O(l) → 4 Co^2+(aq) + O2(g) + 4 H^+(aq) ...

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The oxidation of

H _{2}O(l )

to [la...

Question: 25.7

The standard voltage of the cell Zn(s)|ZnSO4(aq)||CuSO4(aq)|Cu(s) at 25.0°C is E°cell = 1.10 V. Given that E°red = –0.76 V for the electrode half reaction described by Zn^2+(aq, 1 M) + 2 e^− → Zn(s) calculate E°red at 25.0°C for the electrode half reaction given by Cu^2+(aq, 1 M) + 2 e^− → Cu(s) ...

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The oxidation takes place at the left-hand electro...

Question: 23.9

Calculate the values of ΔG°rxn and K at 25°C for the equation PCl3(g) + Cl2(g) ⇋ PCl5(g) ...

Verified Answer:

Application of Equation 23.26 to this equation yie...

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