When water is added to a mixture Na_2O_2(s) and S(s), a redox reaction occurs, a

Question

When water is added to a mixture Na_2O_2(s) and S(s), a redox reaction occurs, as represented by the equation below. 2NaO_2(s) + 2 H_2O(l) rightarrow 4 NaOH (aq) + SO_2(aq) Delta H_298 degree = -610 kJ/mol_rxn; Delta S_298 degree = -73 J/(K mol_rxn) Which of the following statements about the thermodynamic favorability of the reaction at 298 K is correct? (A) It is thermodynamically unfavorable (B) It is thermodynamically favorable and is driven by Delta S degree only. (C) It is favorable and is driven by Delta H degree only. (D) It is thermodynamically favorable and is driven by both Delta H degree and Delta S degree

Explanation / Answer

delta Go= delta Ho -Tdelta So

so from the given values of delta Ho and delta So ...we can see that even if the delta So is negative ..reaction becomes spontaneous ..as the delta Go is negative ..(high negative value of delta Ho)

substitution

delta Go = -610 X 103- (298 X (-7.31))

= -607.82 kJ/mol

hence option C

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