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If 4 grams A and 12 grams B form a compound what is the total compound mass?

Answer and explanation

Correct answer: 16 grams

The governing concept is the law of conservation of mass. When 4 g of A combines with 12 g of B and no material escapes or enters, the mass of the compound equals the sum of the masses of its reactants. Calculation: total mass = mass of A + mass of B = 4 g + 12 g = 16 g. Therefore, option C is correct. Option A is not the sum, option B counts only B and ignores A, while option D results from multiplication rather than mass addition. The conclusion applies to a closed system in which both reactants are completely included in the product.

Related tags

ChemistryConservation Of MassChemical CombinationLaws Of Chemical CombinationSome Basic Concepts Of ChemistryClass 11 Mcq

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