For the reaction 2 , N _2 O _5(g) 4 , NO _2(g)+ O _2(g)

CHEMISTRY · Single correct · A Level · Chemistry · Thermodynamics · Thermodynamics

Problem

For the reaction 2 N2O5(g)→4 NO2(g)+O2(g),2\,\text{N}_2\text{O}_5(g) \rightarrow 4\,\text{NO}_2(g)+\text{O}_2(g), which statement best predicts the sign of ΔS∘\Delta S^{\circ} for the reaction? (a) ΔS∘>0\Delta S^{\circ}>0 because the reaction is exothermic and entropy always increases when heat is released. (b) ΔS∘<0\Delta S^{\circ}<0 because the total number of moles of gas decreases from 44 to 33.},{ (c) ΔS∘>0\Delta S^{\circ}>0 because the total number of moles of gas increases. (d) ΔS∘<0\Delta S^{\circ}<0 because decomposition produces more ordered products.

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