What is the mass in grams of magnesium chloride that can be produced from 2.30 moles of chlorine gas reacting with excess magnesium?

Answer 1

Write the balanced equation:

Cl₂(g) + Mg(s) ==> MgCl₂

1 mol Cl₂ produces 1 mol MgCl₂

2.30 mols Cl₂ produces 2.30 mol MgCl₂

Molar mass MgCl₂ = 95.2 g / mol

mass MgCl₂ = 2.30 mols MgCl₂ x 95.2 g / mol = 218.96 g = 220 g (2 sig. figs.)