Balance the following chemical equation: Pb + PbO2 + H2SO4 > H2O + Pb SO4?

Pb = Pb2+ + 2e- ( oxidation)
PbO2 + 4 H+ + 2e- = Pb2+ + 2 H2O ( reduction)

Pb + PbO2 + 4 H+ = 2 Pb2+ + 2 H2O

add the spectator ion ( SO42-) to get the molecular balanced equation

Pb + PbO2 + 2 H2SO4 = 2 PbSO4 + 2 H2O

go to: http://www.webqc.org/balance.php and it will balance it for you

H2so4 Pb

You wrote a complete mess up. The correct equation is: NaCl + PbSO4 ----> Na2SO4 + PbCl and the balanced equation is 2NaCl + PbSO4 ----> Na2SO4 + PbCl2