Magnesium (Used in the Manufacture of Light Alloys) Reacts with Iron(III)

question 18

Multiple Choice

Magnesium (used in the manufacture of light alloys) reacts with iron(III) chloride to form magnesium chloride and iron. 3Mg(s) + 2FeCl₃(s) → 3MgCl₂(s) + 2Fe(s) A mixture of 41.0 g of magnesium ( = 24.31 g/mol) and 175 g of iron(III) chloride ( = 162.2 g/mol) is allowed to react. Identify the limiting reactant and determine the mass of the excess reactant present in the vessel when the reaction is complete.

• A) Limiting reactant is Mg; 67 g of FeCl₃ remain.
• B) Limiting reactant is Mg; 134 g of FeCl₃ remain.
• C) Limiting reactant is Mg; 104 g of FeCl₃ remain.
• D) Limiting reactant is FeCl₃; 2 g of Mg remain.
• E) Limiting reactant is FeCl₃; 87 g of Mg remain.

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