A 4.379 g sample of MgCl2 is dissolved in enough water to give 750.0 mL of solution. What is the chloride ion concentration in this solution?

Answer 1

mols MgCl2 = grams/molar mass = ?
M MgCl2 = mols/L solution = ?
Since there are two mols Cl in 1 mol MgCl2, then M Cl = twice that of MgCl2.