Where possible, classify these systems as reactant-favored or product-favored at

Question

Where possible, classify these systems as reactant-favored or product-favored at 298 K. If the direction cannot be determined from the information given, classify the reaction as "Insufficient information".

a.) 2A(g)+B(g) ----> C(g)
                        <----
    Delta H = +235KJ
b.) 2A(g)+B(s) ----> C(g)
                        <----
    Delta H = -193KJ

c.) A(g)+B(g) ----> C(g)
                        <----
    Delta H = -97KJ

d.) 2A(g)+2B(g) ----> 5C(g)
                        <----
    Delta H = +313KJ

Explanation / Answer

(a) 2 A(g) + B(g) => C(g)

Delta H = +235 kJ > 0

Delta S < 0 since moles of gas decrease

Delta G = Delta H - T x Delta S > 0

=> reverse reaction is spontaneous

=> reactant-favored

(b) 2 A(g) + B(s) => C(g)

Delta H = -193 kJ < 0

Delta S < 0 since moles of gas decrease

Delta G = Delta H - T x Delta S may be > 0 or < 0

=> insufficient information

(c) A(g) + B(g) => C(g)
                     
Delta H = -97 kJ < 0

Delta S < 0 since moles of gas decrease

Delta G = Delta H - T x Delta S may be > 0 or < 0

=> insufficient information

(d) 2 A(g) + 2 B(g) => 5 C(g)

Delta H = +313 KJ > 0

Delta S > 0 since moles of gas increase

Delta G = Delta H - T x Delta S may be > 0 or < 0

=> insufficient information

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