When ignited, solid ammonium dichromate decomposes in a fiery display. This is the reaction for a "volcano" demonstration. The decomposition produces nitrogen gas, water vapor, and chromium(III) oxide. The temperature is constant at 25°C. SubstanceDHf° (kJ/mol)S° (kJ/mol K)Cr2O3(g)–11470.08118H2O(l)–2420.1187N2(g)00.1915(NH4)2Cr2O7(s)–22.50.1137 Determine DSuniv° (in kJ/mol K) and the spontaneity of this reaction.

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Publisher:Lawrence S. Brown, Tom Holme

Chapter10: Entropy And The Second Law Of Thermodynamics

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When ignited, solid ammonium dichromate decomposes in a fiery display. This is the reaction for a "volcano" demonstration. The decomposition produces nitrogen gas, water vapor, and chromium(III) oxide. The temperature is constant at 25°C.

Substance	DH_f° (kJ/mol)	S° (kJ/mol K)
Cr₂O₃(g)	–1147	0.08118
H₂O(l)	–242	0.1187
N₂(g)	0	0.1915
(NH₄)₂Cr₂O₇(s)	–22.5	0.1137

Determine DS_univ° (in kJ/mol K) and the spontaneity of this reaction.

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