43.38 g of water (H₂O)
Explanation:
We have the following chemical equation:
2 H₂ + O₂ → 2 H₂O
Assuming standard temperature and pressure conditions (STP), we may use the following formula:
number of moles = volume / 22.4 (L/mole)
number of moles of H₂ = 54 / 22.4 = 2.41 moles
Taking in account the chemical reaction, we devise the following reasoning:
if 2 moles of H₂ produces 2 moles of H₂O
then 2.41 moles of H₂ produces X moles of H₂O
X = (2.41 × 2) / 2 = 2.41 moles of H₂O
mass = number of moles × molecular weight
mass of H₂O = 2.41 × 18 = 43.38 g
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molar volume
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