40 Light Music soft uplif Masteringchemistry: Assign Masteringchemistry: ch x G

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40 Light Music soft uplif Masteringchemistry: Assign Masteringchemistry: ch x G pbso4 oxidation number C O session masteringchemistry. /myct/itemview? assignment ProblemID 7739 S8878 offset next Chem 1B TTh CCC Sp 2017 Signed in as Jessica Garcia l Help l Close chapter 19 t Acid Concentration in a Lead Battery Resources previous l 5 of 11 I next Rework for Practice v You completed this assignment. t Acid Concentration in a Lead Battery Part A A lead-acid battery uses a redox reaction in which Suppose that a fully charged lead-acid battery contains 1.50Lof 5.00 MH2SO. What will be the concentration lead(0) and lead (IV) are both converted to lead(ll). of H2SO4 in the battery after 3.90 A of current is drawn from the battery for 8.50 hours This reaction is facilitated by the presence of Express your answer with the appropriate units. sulfuricacid, H2SO4, as shown by the reaction Pb PbO2 2H2SO4 2PbSOM 2H2O 4.18 M Submit Hints My Answers Give Up Review Part Correct eroordeFoodback Continue :21 AM E- Ask me anything 4/19/2017

Explanation / Answer

First, identifty the half reactions

for the lead battery:

anode (oxidation) =

Pb(s)+ SO42-(aq) PbSO4(s)+ 2e-

cathode ( reduction) =

PbO2(s) + 4H+(aq) + 2e- + SO42-(aq) PbSO4(s) + 2H2O(l)

clearly

there are only 2 mol of electrons moving per mol of Pb/PbO2/SO4-2

Note that some times you will have:

A+2 + 2e- --> A(s)

B(s) --> 3e- + B+3

in this case, the answer is not 2, 3 or 5... the overall reaction must be stoichiometrtric so

3A+2 + 6e- --> 3A(s)

2B(s) --> 6e- + 2B+3

overall = 2x3 = 6

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