4.0 g of H2 reacts completely with excess O2 to form H2O. How many grams of H2O are produced? Give the final mass first.
Chemistry
ScanSolve AI Answer
Answer
36 g of H2O are produced.
Step-by-step solution
5 stepsHere are the steps:
Write the balanced chemical equation
2H₂(g) + O₂(g) → 2H₂O(l)
Calculate the moles of H₂
Molar mass of H₂ = 2 * 1.008 g/mol = 2.016 g/mol
Moles of H₂ = Given mass / Molar mass = 4.0 g / 2.016 g/mol = 1.984 mol H₂Use the mole ratio to find moles of H₂O
From the balanced equation, 2 moles of H₂ react to produce 2 moles of H₂O. The mole ratio is 1:1.
Moles of H₂O = Moles of H₂ = 1.984 mol H₂OCalculate the mass of H₂O produced
Molar mass of H₂O = (2 * 1.008 g/mol) + 15.999 g/mol = 18.015 g/mol
Mass of H₂O = Moles of H₂O * Molar mass of H₂O = 1.984 mol * 18.015 g/mol = 35.744 gRound to appropriate significant figures
Since the given mass (4.0 g) has two significant figures, the final answer should also have 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: 4.0 g of H2 reacts completely with excess O2 to form H2O (2H2 + O2 -> 2H2O). What mass…QStoichiometry: 4.0 g of H2 reacts completely with O2 to form H2O. What mass of H2O is produced? Give…QWhen 4.0 g of H2 reacts with excess O2 (2H2 + O2 -> 2H2O), how many grams of water are produced?…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? Show…