0.5 moles of H₂O are formed when one gram of H₂ reacts with how many grams of oxygen?
Correct answer: B. 8
- A. 4
- B. 8
- C. 16
- D. 32
Explanation
From the formula H₂O, 0.5 moles of water must contain 0.5 moles of oxygen atoms. The mass of this amount of oxygen is 0.5 mol × 16 g/mol = 8 grams.
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Mole calculations connect mass, number of particles and Avogadro's number, while balanced equations provide the mole ratios used in stoichiometry. Questions cover limiting and excess reactants, theoretical yield and percentage yield, including identifying which reactant is consumed first and comparing the actual product with the maximum possible product.
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