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Per NCERT §5.5(a), the STANDARD ENTHALPY OF COMBUSTION Δ_c H° of butane (cooking gas) is which?
A−285.83 kJ/mol
B−74.81 kJ/mol
C−2658 kJ/mol — combustion of 1 mol C₄H₁₀ with 13/2 O₂ → 4 CO₂ + 5 H₂O
D+2658 kJ/mol
Answer & Solution
Correct answer: C. −2658 kJ/mol — combustion of 1 mol C₄H₁₀ with 13/2 O₂ → 4 CO₂ + 5 H₂O
Per NCERT §5.5(a), C₄H₁₀ + 13/2 O₂ → 4 CO₂ + 5 H₂O; Δ_c H° = −2658 kJ/mol (exothermic).
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