libelec
Nov9-09, 03:40 PM
1. The problem statement, all variables and given/known data
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).
2. Relevant equations
The semirreactions:
Pb \to P{b^{2 + }} + 2{e^ - }
4{H^ + } + Pb{O_2} + 2{e^ - } \to P{b^{2 + }} + 2{H_2}O
3. 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
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).
2. Relevant equations
The semirreactions:
Pb \to P{b^{2 + }} + 2{e^ - }
4{H^ + } + Pb{O_2} + 2{e^ - } \to P{b^{2 + }} + 2{H_2}O
3. 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