In which of the following reactions is Delta | vedclass

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(C) Entropy change $\Delta S$ is related to the change in the number of moles of gaseous species $\Delta n_g$. $A$ positive $\Delta n_g$ indicates an

Vedclass · Accepted Answer

$CaCO_{3(s)} 	o CaO_{(s)} + CO_{2(g)}$

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(C) Entropy change $\Delta S$ is related to the change in the number of moles of gaseous species $\Delta n_g$. $A$ positive $\Delta n_g$ indicates an increase in the number of gas molecules,leading to a significant increase in entropy.For $Ca_{(s)} + \frac{1}{2} O_{2(g)} 	o CaO_{(s)}$,$\Delta n_g = 0 - 0.5 = -0.5$. Entropy decreases.For $C_{(s)} + O_{2(g)} 	o CO_{2(g)}$,$\Delta n_g = 1 - 1 = 0$. Entropy change is negligible.For $CaCO_{3(s)} 	o CaO_{(s)} + CO_{2(g)}$,$\Delta n_g = 1 - 0 = 1$. Entropy increases significantly as a solid produces a gas.For $N_{2(g)} + O_{2(g)} 	o 2NO_{(g)}$,$\Delta n_g = 2 - 2 = 0$. Entropy change is negligible.Therefore,the reaction with the maximum increase in entropy is $CaCO_{3(s)} 	o CaO_{(s)} + CO_{2(g)}$.

In which of the following reactions is $\Delta S$ maximum?

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