What is the mass in grams of oxygen which contains 1.5 × 10²² molecules?
Correct answer: B. 0.80 g
- A. 0.08 g
- B. 0.80 g
- C. 8.0 g
- D. 80 g
Explanation
First, find the moles of O₂: (1.5 × 10²²) / (6.022 × 10²³) ≈ 0.025 mol. Then, calculate the mass: 0.025 mol × 32 g/mol (for O₂) = 0.8 g.
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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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