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If 5 grams of a substance and 7 grams of another react completely what is total product mass in a closed system?

Answer and explanation

Correct answer: 12 grams

The direct answer is option C: 12 grams. In a closed system, matter is not lost or gained during a chemical reaction. The total mass of all reactants before the reaction equals the total mass of all products after it, provided the system is closed. Here the reactant masses are 5 grams and 7 grams. Step 1: write both masses. Step 2: add them: 5 + 7 = 12 grams. Step 3: therefore, the total product mass is 12 grams. Option A, 2 grams, is the difference between 7 and 5, not the total. Option B, 7 grams, ignores the 5-gram reactant. Option C, 12 grams, correctly applies conservation of mass. Option D, 35 grams, incorrectly multiplies 5 by 7; multiplication is not required. Remember: in a closed reaction, add all reactant masses to obtain total product mass.

Related tags

Chemistry Laws Chemical CombinationLaws Of Chemical CombinationSome Basic Concepts Of ChemistryChemistryClass 11 Mcq

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