Stoichiometry: 4.0 g of H2 reacts completely with O2 to form H2O. What mass of H2O is produced? Give the final mass with correct sig figs.
Chemistry
ScanSolve AI Answer
Answer
36 g of H2O is produced.
Step-by-step solution
7 stepsSteps:
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 = Given mass / Molar mass
Moles of H₂ = 4.0 g / 2.016 g/mol = 1.984 mol H₂Use the mole ratio from the balanced equation to find moles of H₂O
From the balanced equation, 2 moles of H₂ react to produce 2 moles of H₂O.
Therefore, Moles of H₂O = Moles of H₂ = 1.984 mol H₂OCalculate the molar mass of H₂O
Molar mass of H₂O = (2 × 1.008 g/mol) + 16.00 g/mol = 18.016 g/mol
Convert moles of H₂O to mass
Mass of H₂O = Moles of H₂O × Molar mass of H₂O
Mass of H₂O = 1.984 mol × 18.016 g/mol = 35.746 gRound to the correct number of significant figures
The given mass (4.0 g) has two significant figures. Therefore, 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
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? Show…Q4.0 g of H2 reacts completely with excess O2 to form H2O. How many grams of H2O are produced? Give…