For the following question(s),consider the following equation. 2Mg + O 2 → 2MgO -How many grams of MgO are produced when 40.0 grams of O₂ react completely with Mg? A)40.3 g B)50.4 g C)60.5 g D)101 g E)202 g

Question

Quizplus · Accepted Answer

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

For the Following Question(s),consider the Following Equation