Question 18 of 31 Incorrect X General Chemistry 4th Edition McQuarrie • Rock • G

Question

Question 18 of 31 Incorrect X General Chemistry 4th Edition McQuarrie • Rock • Gallogly University Science Books presented by Sapling Learning Use the data given here to calculate the values of AG°rxn at 25 °C for the reaction described by the equation Compound A C AGf (kJ/mol) +387.7 +686.5 +402.0 A+B = C A+B Number Incorrect. Plug the values from the table into this formula. AG = - 367.3 kJ/mol AG. = EAG, (products) – EAG (reactants) If AH°rxn and AS°rxn are both positive values, what drives the spontaneous reaction and in what direction at standard conditions? The spontaneous reaction is entropy-driven to the right. enthalpy-driven to the left. enthalpy-driven to the right. entropy-driven to the left.

Explanation / Answer

Q1.

a)

GRxn = Gproducts - Greactants

Grxn = C - (A+B)

Grxn = 402 - (686.5+387.7)

Grxn = -672.2 kJ/mol

b)

if dH = positive, dS = positive

dG = dH - T*dS < 0

then, this must be ENTROPY endriven, since dH posisitve will not make dG value negative never

choose

entropy driven to the right

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