Practice question
Question
How many grams of MgCl₂ are produced when 9.5 g of Mg(OH)₂ reacts with excess HCl? (Molar masses: Mg(OH)₂ = 58 g/mol, MgCl₂ = 95 g/mol)
Explanation
Reaction: Mg(OH)₂ + 2HCl → MgCl₂ + 2H₂O. Moles of Mg(OH)₂ ≈ 0.1638 mol. 1 mol Mg(OH)₂ produces 1 mol MgCl₂; mass ≈ 15.56 g.
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