Question: how many moles of ions?
Answer: In 1 mol Nacl , there is one mole of Na+ and one mole of Cl- ions . Therefore there are Total two moles of ions in one mole of NaCl . Now , In 2.5mol of NaCl , there is 2.5 moles of Na+ and 2.5moles of Cl- ions . Therefore , Total 5 moles of ions will be there .