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chemistry stoichiometry problem sheet 2 key Outline: Balanced equation: 2H₂ + O₂ → 2H₂O Molar mass of H₂: 2 g/mol Moles of H₂: 10 g / 2 g/mol = 5 mol Mole ratio: 2 mol H₂ : 2 mol H₂O → 1:1 Moles of H₂O: 5 mol Molar mass of H₂O: 18 g/mol Mass of H₂O: 5 mol × 18 g/mol = 90 K Kaylee Blick May 4, 2026
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chemistry solution concentration practice problems answer key 5 M solution? Solution: Molar mass of NaOH ≈ 40 g/mol Given: V = 1 L C = 0.25 mol/L Calculate moles of NaOH: \[ \text{Moles} = 0.25 \, \text{mol} \] Calculate grams: \[ \text{Mass} = \text{moles} \times \text{molar mass} = 0.25 \times 40 = 10\, \te L Laura Runte Nov 18, 2025
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