According to the law of conservation of mass, the total mass of the reactants must equal the total mass of the products in a chemical reaction. In this case, you have 24 grams of magnesium (Mg) and 16 grams of oxygen (O2) reacting to form magnesium oxide (MgO).
To find the total mass of magnesium oxide formed:
Total mass of reactants = mass of magnesium + mass of oxygen Total mass of reactants = 24 g + 16 g = 40 g
Therefore, according to the conservation of mass, the mass of magnesium oxide produced will also be 40 grams.
The correct answer is D. 40 g.
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