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12 January, 11:08

Calculate the mass of water produced when 3.03 g of butane reacts with excess oxygen.

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  1. 12 January, 13:05
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    The mass of water produced is 4.70 g.

    M_r: 58.12 32.00

    2C₄H₁₀ + 13O₂ ⟶ 8CO₂ + 10H₂O

    m/g: 3.03

    Moles of C₄H₁₀ = 3.03 g C₄H₁₀ * (1 mol C₄H₁₀/58.12 g C₄H₁₀) = 0.05 213 mol C₄H₁₀

    Moles of H₂O = 0.052 13 mol C₄H₁₀ * (10 mol H₂O/2 mol C₄H₁₀) = 0.2607 mol H₂O

    Mass of H₂O = 0.2607 mol H₂O * (18.02 g H₂O/1 mol H₂O) = 4.70 g H₂O
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