[Olympiad] For a reaction, ΔH = +40 kJ/mol and ΔS = +100 J/mol·K. At what temperature (in Kelvin) does the reaction become spontaneous?
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200 K
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300 K
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400 K
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500 K
📝 Detailed explanation
ΔG = ΔH - TΔS. Spontaneity starts when ΔG < 0. 40,000 - T(100) < 0 => 100T > 40,000 => T > 400 K.
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