Guess the sign ( + or -) of (Delta symbol) S system for each of specific reactions A3+ (ag) + 3B-(aq) --> AB3 ( s) A2 (g) --> A2 (I) 4A(g) + 6 B (s) ---> 2C(g) + 3 D(g) C(g) 400K ---> C(g) 800K B(s) + 3C(g) ----> 5D(I) + 2 E(g) Phase change X2 (g) ---> X2(I) (Delta symbol) H= - 12

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Guess the sign ( + or -) of (Delta symbol) S system for each of specific reactions

A^{3+ (ag) + 3B-(aq) --> AB}_{3 ( s)}

A_{2 (g) --> A2 (I)}

_{4A(g) + 6 B (s) ---> 2C(g) + 3 D(g)}

C(g) 400K ---> C(g) 800K

B(s) + 3C(g) ----> 5D(I) + 2 E(g)

Phase change X2 (g) ---> X2(I)

(Delta symbol) H= - 12.0 kj/mol and ( Delta symbol) S= -92.9 J/ mol K.

At a temperature of 81 celsius, calculate ( Delta symbol) S surr, ( Delta symbol) S univ and determine if the reaction is spontaneous.