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For an element X, the following standard reduction potentials exist at 25 °C: X^3+(aq) + 2...

For an element X, the following standard reduction potentials exist at 25 °C:

X^3+(aq) + 2 e– → X^+(aq) ε1° = 1.199 V

X^4+(aq) + 3 e– → X^+(aq) ε2° = 1.243 V

If [X^+] = 0.179 M, [X^3+] = 5.827 M, and [X^4+] = 0.173 M, at what temperature (in °C) will the galvanic/voltaic cell made from the above two half-reactions begins to become nonspontaneous?

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