Question

use the following balanced equation to answer the questions: 2mg + o₂ → 2mgo. how many atoms of magnesium are present?

Explanation:

Step1: Identify coefficient of Mg

The balanced equation is $2Mg + O_2
ightarrow2MgO$. The coefficient of $Mg$ is 2.

Step2: Determine number of atoms

Each coefficient represents the number of moles of the substance, and since 1 mole of any substance contains Avogadro's number of atoms, for $Mg$ here, the number of atoms is based on the coefficient. So there are 2 atoms of magnesium in the reactant side as indicated by the coefficient in the balanced - chemical equation.

Answer:

2