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UHS MDCAT 2025 Chemistry uhs mdcat chemistry 2025 #Percentage Yield #Stoichiometry

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Consider the given balanced chemical equation: 2H₂ + O₂ → 2H₂O. If 4 g of H₂ reacts with 32 g of O₂ to produce 28 g of H₂O, what is the percentage yield of the reaction?

Verified Answer & Explanation⌄

Correct Answer: B) 77.8%

Concept Explanation

4 g H₂ = 2 mol and 32 g O₂ = 1 mol, which can form 2 mol H₂O = 36 g. Percent yield = 28/36 × 100 = 77.8%.

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