Posted by nalleli on Monday, October 4, 2010 at 12:41am.
Convert 4.691 g MgCl2 to moles. moles = grams/molar mass.
There is 1 Mg ion/molecule MgCl2; therefore, moles Mg = moles MgCl2.
M Mg ion = moles/L = moles from above/0.750 = ??
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