Final answer:
The correct whole number coefficient for lead(II) nitrate in chemical equations is 1, as shown in the example reaction where it is used without any multiplier.
Step-by-step explanation:
The correct whole number coefficient for lead(II) nitrate when balancing chemical equations is 1. This coefficient indicates that there is one mole of lead(II) nitrate reacting or being produced, depending on the context of the chemical equation. For example, in the balanced reaction between lead(II) nitrate and potassium iodide, the equation Pb(NO3)2 (aq) + 2 KI (aq) → PbI2 (s) + 2 KNO3 (aq) shows that one mole of lead(II) nitrate reacts with two moles of potassium iodide to produce one mole of lead(II) iodide and two moles of potassium nitrate. In this reaction, the coefficient for lead(II) nitrate is 1, which corresponds to option B.