Stoichiometry: 4.0 g of H2 reacts completely with O2 to form H2O. What mass of H2O is produced? Show the worked solution
Chemistry
ScanSolve AI Answer
Answer
The mass of H2O produced is 36 g.
Step-by-step solution
7 stepsWorked Solution:
Write the balanced chemical equation
2H₂(g) + O₂(g) → 2H₂O(l)
Calculate the molar mass of H₂
Molar mass of H₂ = 2 × (1.008 g/mol) = 2.016 g/mol
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 molUse 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 molCalculate 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
Convert moles of H₂O to mass
Mass of H₂O = Moles × Molar mass
Mass of H₂O = 1.984 mol × 18.015 g/mol ≈ 35.74 gRound 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
Was this helpful?
Still stuck on this one?
Ask a follow-up, and the answer starts from this question.
Got a different question?Ask your own question
More Chemistry Questions
QA reaction is 2 H2 + O2 -> 2 H2O. If 4.0 g of H2 reacts completely with excess O2, what mass of H2O…QStoichiometry: 4.0 g of H2 reacts completely with O2 to form H2O. What mass of H2O is produced? Give…QStoichiometry: 4.0 g of H2 reacts completely with O2 to form H2O. What mass of H2O is produced? Give…QA reaction: 4.0 g of H2 reacts completely with excess O2 to form H2O (2H2 + O2 -> 2H2O). What mass…Q4.0 g of H2 reacts completely with excess O2 to form H2O. How many grams of H2O are produced? Give…