If for a certain reaction Δ r H is 30 kJmol - 1 at 450 K , the value of Δ r S (in JK - 1 mol - 1 ) for which the same reaction will be spontaneous at the same temperature is

Question

If for a certain reaction Δ r H is 30 kJmol - 1 at 450 K , the value of Δ r S (in JK - 1 mol - 1 ) for which the same reaction will be spontaneous at the same temperature is, 70, - 33, 33, - 70

MARKS App · Accepted Answer

ΔG = ΔH - TΔS For spontaneous, Δ G 0 Δ H - T Δ S O Δ S > Δ H T Δ S > 30 × 10 3 Jmol - 1 450 K Δ S > 66 . 6 Jmol - 1 K - 1 (Check by options) So, option (1) , i.e. $70 \mathrm{~J} \mathrm{mol}^{-1} \mathrm{~K}^{-1}$ satisfies it.

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