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In a reaction 7 grams and 9 grams reactants combine. What is total product mass in a closed system?

Answer and explanation

Correct answer: 16 grams

The direct answer is option C: 16 grams. In a closed system, matter is not created or destroyed during an ordinary chemical reaction. Therefore, when the reactants are completely considered, their total mass equals the total mass of the products. Step 1: mass of the first reactant = 7 g. Step 2: mass of the second reactant = 9 g. Step 3: total reactant mass = 7 + 9 = 16 g. Thus, product mass = 16 g. Option A, 2 g, is the difference between the two masses, not their total. Option B, 9 g, counts only one reactant. Option C correctly applies the law of conservation of mass. Option D, 18 g, results from an incorrect addition. Memory cue: in a closed system, total mass before reaction equals total mass after reaction.

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