(A) Calculate the standard reaction entropy at 298.15 K for the synthesis of ammonia from its elements.

(B) N₂O₃ is an unstable oxide that readily decomposes. The standard reaction entropy for the decomposition of N₂O₃ to nitrogen monoxide and nitrogen dioxide at 25 °C is Δ_rS° = 138.5 J mol^-1 K^-1. What is the standard molar entropy of N₂O₃(g) at 25 °C?

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N2(g) + 3 H₂(g) 2 NH3(g) A₁S⁰ = ?