Question

Verify the following chemical equation is balanced.

2Mg + O₂ → 2MgO
With 3 moles of O₂, how many moles of Mg would be needed to react? (Write only the number of moles in the blank to answer the question! For example, write 3 not 3 moles.)

Answer 1

The given chemical equation 2Mg + O₂ → 2MgO is balanced. 6 moles of Mg would be needed to react with 3 moles of O₂.

Step-by-step explanation:

The given chemical equation 2Mg + O₂ → 2MgO is balanced. The equation shows that 2 moles of magnesium (Mg) react with 1 mole of oxygen (O₂) to produce 2 moles of magnesium oxide (MgO).

Since the ratio of Mg to O₂ in the balanced equation is 2:1, we can determine the moles of Mg required to react with 3 moles of O₂ by setting up a proportion:

(2 moles of Mg) / (1 mole of O₂) = (x moles of Mg) / (3 moles of O₂)

Cross multiplying, we get:

2 * 3 = 1 * x

6 = x

Therefore, 6 moles of Mg would be needed to react with 3 moles of O₂.