Question 3 of 5 (1 point)xIncorrect 4q E\" = 1.251. ex 2MnO2(s)-H2O(I) +2e- Mn2O

Question

Question 3 of 5 (1 point)xIncorrect 4q E" = 1.251. ex 2MnO2(s)-H2O(I) +2e- Mn2O3(s) +2OH-(aq) E" = 0.151. red Suppose a C battery has a capacity of 9.56 W-hr at an average voltage during discharge that is 88.0% of the standard cell potential. Answer the three questions below. (a) How much electrical energy in joules can the battery supply? Number (b) How much electrical charge in ampere-hours can the battery deliver at the average discharge voltage? Number A. hr (c) After complete discharge, how many moles of electrons have been transferred?

Explanation / Answer

a)

Etotal = 9.56 W/h = 9.56 J/s*h = 9.56 J/s*3600s = 34416 J

b)

find total charg ein A-hr can deliver

P = IV

V = --> E°cell = Ered - Epx = 1.25-0.15 = 1.10 V

assume t = 1 h

P = 34416 J per hour

I = P/V = 34416 /1.1

I = 31287.2 A-h

this is at 100%, at only 88% --> 0.88*31287.2 = 27532.736 A-hr

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