Question

A car battery produces electrical energy with the following chemical reaction. Pb + PbO2 + 2H2SO4 es001-1.jpg; 2PbSO4 + 2H2O What is the mole ratio of PbO2 to water?

Answer 1

The  mole  ratio of PbO2 to   water  in

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

            1 :2

1  mole of Pb reacted  with 1  mole  of PbO2    and 2  moles of H2SO4 to form 2 moles of PbSO4 and 2  moles of  H2O

therefore  the mole ratio  of Pbo2 to H2O is  1:2

Answer 2

Taking into account the reaction stoichiometry, the mole ratio of PbO₂ to water PbO₂:H₂O is 1:2.

The balanced reaction is:

Pb + PbO₂ + 2 H₂SO₄ → 2 PbSO₄ + 2 H₂O

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

• Pb: 1 mole
• PbO₂: 1 mole
• H₂SO₄: 2moles
• PbSO₄: 2 moles  
• H₂O: 2 moles

Then, you can observe that by stoichiometry of the reaction 1 mole of PbO₂ forms 2 moles of water (H₂O).

Finally, the mole ratio of PbO₂ to water PbO₂:H₂O is 1:2.

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