Final answer:
The coefficient of Pb2+ in the balanced equation is 2.
Step-by-step explanation:
The balanced equation provided is:
2Pb²+(aq) + 4Au²+(aq) → 2Pb4+(aq) + 4Au(s)
The coefficient of Pb2+ in the balanced equation is 2.
In the balanced equation, there are 2 moles of Pb²+ on the left side reacting with 4 moles of Au²+ to produce 2 moles of Pb4+ and 4 moles of Au. Therefore, the coefficient of Pb2+ is 2.