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Practice question

MCQ

Question

For the reaction CH₄(g) + 2O₂(g) → CO₂(g) + 2H₂O(l) , Δ H = -890.00 kJ/mol at 298 K. What is Δ U ? ( R = 8.314 J/mol·K )

Options

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Explanation

For Δ ng = 1 - 3 = -2 , RT = 8.314 × 298 × 10⁻³ = 2.4776 kJ . Using Δ H = Δ U + Δ ng RT , Δ U = -890.00 - (-2 × 2.4776) = -890.00 + 4.9552 = -885.04 ≈ -885.0 kJ/mol .

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