For the synthesis of ammonia at 298 K, N (g) + 3 H (g) → 2 NH (g) what is the…
CHEMISTRY · Single correct · A Level · Chemistry · Thermodynamics · Thermodynamics
Problem
For the synthesis of ammonia at 298 K,
N2(g) + 3 H2(g) → 2 NH3(g)
what is the expected sign of ΔS∘ for the reaction?
(a) Positive, because the reaction produces more moles of gas, increasing disorder.
(b) Negative, because the total number of moles of gas decreases.
(c) Cannot be determined without the absolute molar entropies of all species.
(d) Negative, because the reaction releases heat, which lowers entropy.