For the question(s) that follow, consider the following equation.
2Mg + O₂ → 2MgO
-How many grams of MgO are produced when 40.0 grams of O₂ react completely with Mg?

Question

Quizplus · Accepted Answer

The molar mass of O₂ is 32 g/mol, so 40.0 g of O₂ is 40.0/32 = 1.25 mol. According to the balanced equation, 1 mol of O₂ produces 2 mol of MgO. Therefore, 1.25 mol of O₂ will produce 2.5 mol of MgO. The molar mass of MgO is 40.3 g/mol, so 2.5 mol of MgO is 2.5 * 40.3 = 100.75 g, which rounds to 101 g.

For the Question(s) That Follow, Consider the Following Equation