Final answer:
The size of the battery does not affect the number of moles of electrons delivered at a given time in primary batteries. However, it does affect the overall energy capacity.
Step-by-step explanation:
The statement that is not true of primary batteries is The size of the battery affects the number of moles of electrons delivered at a given time.
Primary batteries, such as alkaline batteries and zinc-carbon dry cells, deliver a specific voltage regardless of their size. The voltage is determined by the chemical reaction happening inside the battery. However, the size of the battery does affect the overall energy capacity, which is the amount of energy the battery can deliver over time.
For example, an alkaline battery can deliver about three to five times the energy of a zinc-carbon dry cell of similar size. This means that the alkaline battery can power a device for a longer period of time compared to the zinc-carbon dry cell of the same size.