The balanced equation for the decomposition of magnesium chloride hexahydrate (MgCl2*6H2O) to drive off water of crystallization is:
MgCl2*6H2O(s) → MgCl2(s) + 6H2O(g)
Note that the transition from solid to gas is driven by heating the compound.
balance equation of MgCl2*6H2O heated to drive off water of crystallization
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