According to the law of conservation of mass, the mass of the reactants must equal the mass of the products in a chemical reaction. In this case, you have:
- Mass of magnesium (Mg) = 24 grams
- Mass of oxygen (O₂) = 16 grams
To find the total mass of magnesium oxide (MgO) formed after the reaction, you simply add the mass of magnesium to the mass of oxygen:
\[ \text{Total mass of reactants} = \text{Mass of magnesium} + \text{Mass of oxygen} = 24 , \text{grams} + 16 , \text{grams} = 40 , \text{grams} \]
Therefore, according to the law of conservation of mass, the mass of magnesium oxide produced will be 40 grams after the chemical change is complete.
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