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Ch.20 - Electrochemistry
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All textbooksBrown 14th EditionCh.20 - ElectrochemistryProblem 80a

Chapter 20, Problem 80a

Li-ion batteries used in automobiles typically use a LiMn2O4 cathode in place of the LiCoO2 cathode found in most Li-ion batteries. (a) Calculate the mass percent lithium in each electrode material.

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Hi everyone here we have a question telling us in a nickel cadmium battery. Academy in metal is used in the an ode. And nikola oxy hydroxide is at the cathode. And the question is, what is the mass percent of nickel and nickel oxy hydroxide? So mass percent equals the mass of an element over the mass of the compound times 100. So the molar mass of nickel oxy hydroxide consists of nickel, Which is 58. 34 g per mole oxygen, Which is 16.0 g per mole hydrogen, Which is 1.008 g per mole. So Nicole oxy hydroxide equals .6934 g per mole Plus 16.0 g per mole Times two. Because there's two oxygen's Plus 1.008 g per mole. And that equals 91. grams per mole. So our mass percent equals .6934g Permal divided by 91. g per mole times two equals 64.0%. And that is our final answer. Thank you for watching. Bye.
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In some applications nickel–cadmium batteries have been replaced by nickel–zinc batteries. The overall cell reaction for this relatively new battery is: 2 H2O1l2 + 2 NiO1OH21s2 + Zn1s2 ¡ 2 Ni1OH221s2 + Zn1OH221s2 (b)What is the anode half-reaction?

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In some applications nickel–cadmium batteries have been replaced by nickel–zinc batteries. The overall cell reaction for this relatively new battery is: 2 H2O1l2 + 2 NiO1OH21s2 + Zn1s2 ¡ 2 Ni1OH221s2 + Zn1OH221s2 (d) Would you expect the specific energy density of a nickel–zinc battery to be higher or lower than that of a nickel–cadmium battery?

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Textbook Question

Li-ion batteries used in automobiles typically use a LiMn2O4 cathode in place of the LiCoO2 cathode found in most Li-ion batteries. (b) Which material has a higher percentage of lithium? Does this help to explain why batteries made with LiMn2O4 cathodes deliver less power on discharging?

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Textbook Question

Li-ion batteries used in automobiles typically use a LiMn2O4 cathode in place of the LiCoO2 cathode found in most Li-ion batteries. (c) In a battery that uses a LiCoO2 cathode, approximately 50% of the lithium migrates from the cathode to the anode on charging. In a battery that uses a LiMn2O4 cathode, what fraction of the lithium in LiMn2O4 would need to migrate out of the cathode to deliver the same amount of lithium to the graphite anode?

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Textbook Question

(a) Which reaction is spontaneous in the hydrogen fuel cell: hydrogen gas plus oxygen gas makes water, or water makes hydrogen gas plus oxygen gas?

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