This chemistry question involves key chemical concepts and calculations. The detailed solution below walks through each step, from identifying the reaction type to computing the final answer.
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multipleQuestions newQuestion 4.0 g of H2 reacts completely with O2 to form H2O. What mass of H2O is produced? Show the worked solution newAnswer 36 g of H2O is produced. Worked Solution: 1. Write the balanced chemical equation: 2H₂(g) + O₂(g) → 2H₂O(l) 2. Calculate the molar masses: Molar mass of H₂ = 2 × 1.008 g/mol = 2.016 g/mol Molar mass of H₂O = (2 × 1.008 g/mol) + (1 × 15.999 g/mol) = 18.015 g/mol 3. Convert the given mass of H₂ to moles: Moles of H₂ = Mass of H₂ / Molar mass of H₂ Moles of H₂ = 4.0 g / 2.016 g/mol = 1.984 mol H₂ 4. Use the mole ratio from the balanced equation to find moles of H₂O: From the balanced equation, 2 moles of H₂ produce 2 moles of H₂O. The mole ratio is 1:1. Moles of H₂O = Moles of H₂ = 1.984 mol H₂O 5. Convert moles of H₂O to mass of H₂O: Mass of H₂O = Moles of H₂O × Molar mass of H₂O Mass of H₂O = 1.984 mol × 18.015 g/mol = 35.744 g 6. Round to appropriate significant figures: The given mass (4.0 g) has two significant figures, so the answer should be rounded to two significant figures. Mass of H₂O = 36 g