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Alycia Zemlak

Feb 20, 2025

Determine the optimum mass ratio of Zn to MnO2 in an alkaline battery.Express your answer using four significant figures.?

(Answer is not 0.3757 or 0.3736)(no additional values were provided in this question)
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An alkaline battery produces electrical energy according to the following equation. Zn(s) + 2 MnO2(s) + H2O(l) = Zn(OH)2(s) + Mn2O3(s)1mol Zn requires 2 mol MnO2 Molar mass Zn = 65.39g/mol Molar mass MnO2 = 54.94+2*16 = 86.94g/mol 2mol = 173.88g 65.39g Zn reacts with 173.88g MnO2 1g Zn will react with 173.88g/65.39g MnO2 Mass ratio = Zn : MnO2 = 1: (173.88/65.39) Mass ratio = Zn:MnO2 = 1: 2.659If you reverse this and calculate: 173.88g MnO2 will react with 65.39g Zn Then ratio = 65.39/173.88 = 1: 0.3761 ( which is what you got , allowing for slight molar mass differences) This is the mass ratio MnO2: Zn - which is not what was asked.... Show More
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