An unknown compound has the following chemical formula: Mg, C12
where x stands for a whole number.
Measurements also show that a certain sample of the unknown compound contains 4.3 mol of magnesium and 8.62 mol of chlorine.
Write the complete chemical formula for the unknown compound.

 MgCl2

Explanation:  The ratio of moles of Cl to Mg is 2 to 1 (8.62 mole Cl to 4.3 moles Mg).  The empiracle formula is therefore MgCl2

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