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Indian Navy SSR c11enthalpy_hess — practice questions

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Per NCERT §5.4(a), the STANDARD STATE of a substance at a specified temperature is which?Per NCERT §5.4(e) (worked example), given C+O₂→CO₂ ΔH = −393.5 and CO+½O₂→CO₂ ΔH = −283.0 kJ/mol, what is Δ_f