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Verified Answer :

mass = mol x Mr
= 8.90 x (24.3 + (2)(35.5))
= 848.17g

Moles= weight of the given compound /molecular mass of that compound.

Therefore Weight of MgCl2= moles of MgCl2 x molecular mass of MgCl2
= 8.90 moles x (molecular weight of Mg+ 2 x molecular weight of Cl)
= 8.90 x (24 + 2x 35.5)
~ 845. 5gm.

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