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.
ScanSolve AI Answer
The mass of H2O produced is 36 g. Worked Solution: 1. Write the balanced chemical equation: 2H₂(g) + O₂(g) → 2H₂O(l) 2. Calculate the molar mass of H₂: Molar mass of H₂ = 2 × (1.008 g/mol) = 2.016 g/mol 3. Convert the mass of H₂ to moles: Moles of H₂ = Mass / Molar mass Moles of H₂ = 4.0 g / 2.016 g/mol ≈ 1.984 mol 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 5. Calculate the molar mass of H₂O: Molar mass of H₂O = (2 × 1.008 g/mol) + (1 × 15.999 g/mol) = 2.016 g/mol + 15.999 g/mol = 18.015 g/mol 6. Convert moles of H₂O to mass: Mass of H₂O = Moles × Molar mass Mass of H₂O = 1.984 mol × 18.015 g/mol ≈ 35.74 g 7. Round to appropriate significant figures: The given mass (4.0 g) has two significant figures. Therefore, the answer should be rounded to two significant figures. Mass of H₂O ≈ 36 g