Substance or Ion CCl4(l) CF4(g) CN (aa) CO(g) CO2(g) CO3 (aq) CS2(g) CS2(l) COC1

Question

Substance or Ion CCl4(l) CF4(g) CN (aa) CO(g) CO2(g) CO3 (aq) CS2(g) CS2(l) COC12(g) HCN(aq) HCN(g) HCN(l HCO3 (aa) Hydrocarbons CH4(g) C2H2(g) C2H4(g) C2H60g) C3H8(g) C4H10 (g) AG AHR (kJ/mol) (J/mol K) (kJ/mol) 65.27 216.4 135.4 888.5 261.3 933.2 118 166 151 110.5 137.2 197.5 393.5 394.4 213.7 56.9 677.1 527.9 66.85 237.9 116.9 65.27 151.3 89.70 205.9 283.9 220.1 94.1 172.4 150.6 124.7 201.7 135.1 112.8 124.9 108.9 91.2 586.8 692.0 50.80 186.1 74.87 226.7 209.2 200.9 68.39 219.2 52.47 32.89 229.5 84.68 104.7 23.6 270.2 310.1 17.2 125.6 269,2 1297

Explanation / Answer

Entropy is a measure of the amount of energy wasted in the reaction

In a process, generally energy is produced for a feasible reaction but all the energy cannot be converted for performing work and some energy will be wasted in the form of heat

A negative entropy implies that the wasted energy is again converted back to work, leading to the reduction in entropy

From table, the entropy of CO3(2-) is negative, reason: since CO2 is more stable because of smaller size of carbon atom it can handle 2 oxygen atoms but the third oxygen atoms provide repulsion leading to lower stability and hence negative entropy

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