(C) For reaction $(I)$:$2 Cl_{(g)} \longrightarrow Cl_{2(g)}$$\Delta n_g = 1 - 2 = -1$Since the number of moles of gas decreases, the entropy decrease

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(C) For reaction $(I)$:$2 Cl_{(g)} \longrightarrow Cl_{2(g)}$$\Delta n_g = 1 - 2 = -1$Since the number of moles of gas decreases, the entropy decreases, so $\Delta S For reaction $(II)$:$CO_{2(g)} \longrightarrow CO_{(g)} + \frac{1}{2} O_{2(g)}$$\Delta n_g = (1 + 0.5) - 1 = 0.5$Since the number of moles of gas increases, the entropy increases, so $\Delta S > 0$.Therefore, the signs are negative and positive.

Class 11 Chemistry Thermodynamics 2 nd Law of thermodynamics and Entropy

Medium

For the reactions,
$2 Cl_{(g)} \longrightarrow Cl_{2(g)}$
$CO_{2(g)} \longrightarrow CO_{(g)} + \frac{1}{2} O_{2(g)}$
What are the signs of $\Delta S$, respectively?

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A
Positive and positive
B
Positive and negative
C
Negative and positive
D
Negative and negative

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2 nd Law of thermodynamics and Entropy

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For the reactions,$2 Cl_{(g)} \longrightarrow Cl_{2(g)}$$CO_{2(g)} \longrightarrow CO_{(g)} + \frac{1}{2} O_{2(g)}$What are the signs of $\Delta S$, respectively?

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Which of the following processes is associated with a decrease in entropy?

One mole of $NaCl$ $(s)$ on melting absorbed $30.5 \ kJ$ of heat and its entropy increased by $28.8 \ J \ K^{-1}$. The melting point of $NaCl$ is ............. $K$.

What is the entropy change in $J K^{-1}$ during the melting of $27.3 \ g$ of ice at $0^{\circ} C$? (Latent heat of fusion of ice $= 330 \ J g^{-1}$)

The standard entropies of $CO_{2(g)}$,$C_{(s)}$ and $O_{2(g)}$ are $213.5$,$5.690$ and $205 \ J \ K^{-1} \ mol^{-1}$ respectively. The standard entropy of formation of $CO_{2(g)}$ is ...... $J \ K^{-1} \ mol^{-1}$.

Heat has a randomizing influence on a system,and temperature is the measure of the average chaotic motion of particles in the system. Write the mathematical relation that relates these three parameters.

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For the reactions,
$2 Cl_{(g)} \longrightarrow Cl_{2(g)}$
$CO_{2(g)} \longrightarrow CO_{(g)} + \frac{1}{2} O_{2(g)}$
What are the signs of $\Delta S$, respectively?