Magnesium will react with carbon dioxide to form magnesium oxide and carbon.
2 Mg(s) + CO₂(g) → 2MgO(s) + C(s)
20) 0 grams of magnesium react completely with excess carbon dioxide. How many grams of solid product should be formed?

Question

Quizplus · Accepted Answer

The molar mass of Mg is 24.31 g/mol, so 200 g of Mg is 8.23 mol. The reaction produces 2 moles of MgO for every 2 moles of Mg, so 8.23 mol of Mg will produce 8.23 mol of MgO. The molar mass of MgO is 40.31 g/mol, so 8.23 mol of MgO weighs 331.76 g. However, since the question asks for the mass of solid product (MgO and C), we must also consider the carbon produced. The reaction produces 1 mole of C for every 2 moles of Mg, so 8.23 mol of Mg will produce 4.115 mol of C. The molar mass of C is 12.01 g/mol, so 4.115 mol of C weighs 49.43 g. Adding the masses of MgO and C gives 331.76 g + 49.43 g = 381.19 g, which rounds to 38.1 g.

Magnesium Will React with Carbon Dioxide to Form Magnesium Oxide