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I assume that is 28.0 grams.

28.0 grams MgCl2 (1 mole MgCl2/95.21 grams)

= 0.294 moles magnesium chloride

==========================Now,

One mole Mg 2+ = 0.294 moles Mg 2+ ions

=============================

2 moles Cl - = 0.588 moles Cl - ions

=========================

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