Chapter 21: Problem 25
Describe the uses of the following compounds: \(\mathrm{NaCl}, \mathrm{Na}_{2} \mathrm{CO}_{3}, \mathrm{NaOH}, \mathrm{KOH}, \mathrm{KO}_{2}\)
Chapter 21: Problem 25
Describe the uses of the following compounds: \(\mathrm{NaCl}, \mathrm{Na}_{2} \mathrm{CO}_{3}, \mathrm{NaOH}, \mathrm{KOH}, \mathrm{KO}_{2}\)
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List the sulfates of the Group 2 A metals in order of increasing solubility in water. Explain the trend. (Hint: You need to consult a chemistry handbook.)
In the Mond process for the purification of nickel, CO is passed over metallic nickel to give \(\mathrm{Ni}(\mathrm{CO})_{4}\) : $$\mathrm{Ni}(s)+4 \mathrm{CO}(g) \Longrightarrow \mathrm{Ni}(\mathrm{CO})_{4}(g)$$Given that the standard free energies of formation of \(\mathrm{CO}(g)\) and \(\mathrm{Ni}(\mathrm{CO})_{4}(g)\) are \(-137.3 \mathrm{~kJ} / \mathrm{mol}\) and \(-587.4 \mathrm{~kJ} / \mathrm{mol},\) respectively, calculate the equilibrium constant of the reaction at \(80^{\circ} \mathrm{C}\). (Assume \(\Delta G_{\mathrm{f}}^{\circ}\) to be independent of temperature.
The overall reaction for the electrolytic production of aluminum by means of the Hall process may be represented as $$\mathrm{Al}_{2} \mathrm{O}_{3}(s)+3 \mathrm{C}(s) \longrightarrow 2 \mathrm{Al}(l)+3 \mathrm{CO}(g)$$ At \(1000^{\circ} \mathrm{C}\), the standard free-energy change for this process is \(594 \mathrm{~kJ} / \mathrm{mol} .\) (a) Calculate the minimum voltage required to produce 1 mole of aluminum at this temperature. (b) If the actual voltage applied is exactly three times the ideal value, calculate the energy required to produce \(1.00 \mathrm{~kg}\) of the metal.
With the Hall process, how many hours will it take to deposit \(664 \mathrm{~g}\) of \(\mathrm{Al}\) at a current of \(32.6 \mathrm{~A} ?\)
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