Final answer:
The moles of bromide ion in one liter of calcium bromide are twice the moles of calcium ions.
Step-by-step explanation:
The moles of bromide ion in one liter of calcium bromide are twice the moles of calcium ions (Choice B). This is because calcium bromide is an ionic compound with the formula CaBr2, which means it consists of one calcium ion (Ca²+) and two bromide ions (Br⁻). The mole ratio between calcium ions and bromide ions is 1:2, so the number of moles of bromide ions is twice the number of moles of calcium ions.