A sample of 0.2 moles of magnesium bromide. What is the number of moles of magnesium ions and bromide ions?

The answer is 0.2 moles

Firstly write the half ionic equation of MgBr2 (magnesium bromide).
MgBr2 arrow Mg^2+ + 2Br^-
Then write the molar ratio of MgBr2 and Mg^2+ which is 1:1.
Therefore the number of moles of Mg^2+ is 0.2 moles

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