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libelec
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Homework Statement
In discharge mode, calculate the variation in mass of the compounds of a lead-acid battery if the sufuric acid mass decreases by 294g (3 moles).
Homework Equations
The semirreactions:
[tex]Pb \to P{b^{2 + }} + 2{e^ - }[/tex]
[tex]4{H^ + } + Pb{O_2} + 2{e^ - } \to P{b^{2 + }} + 2{H_2}O[/tex]
The Attempt at a Solution
The only thing I could deduce was that if the H2SO4 decreases in 3 moles, then this means that 3 moles of PbSO4 were formed, along with 3 moles of H2O (since the relation is 1 mole of each of the former formed for each mole of H2SO4 consumed).
But I can't figure out what would happen to the Pb or the PbO2.
I have the answers: Pb increases in 1,5 moles and PbO2 decreases in 1,5 moles.
Any ideas?
Thanks