Final answer:
In 1.75 moles of calcium fluoride (CaF2), there are 1.75 moles of Ca²+ ions and 3.5 moles of F¯ ions.
Step-by-step explanation:
When calculating the number of moles in positive and negative ions in 1.75 moles of calcium fluoride (CaF2), we need to consider the ratio of ions in the compound. In CaF2, there is one calcium ion (Ca²+) and two fluoride ions (F¯). Thus, for every mole of CaF2, there is one mole of Ca²+ and two moles of F¯ ions. Therefore, in 1.75 moles of CaF2, there would be 1.75 moles of Ca²+ ions and 3.5 moles of F¯ ions.