For which of the following processes value of Δ S is negative?

Question

For which of the following processes value of Δ S is negative? (A) H2(.g.) arrow 2H(.g.) (B)  mathrmN2( mathrm~g)(1 mathrm~atm) arrow mathrmN2( mathrm~g)(8 mathrm~atm) (C) 2SO3(.g.) arrow 2SO2(.g.)+O2(.g.) (D) C(. d i a m o n d .) arrow C(. g r a p h i t e .)

Tardigrade Admin · Accepted Answer

Processes text(A) and text(C) take place with the increase of no. of moles of gaseous species and hence the disorder or entropy increases. (.B.) on increasing pressure, disorder or randomness decreases and so also the entropy (.D.) is endothermic process and Δ S is positive.

Q. For which of the following processes value of $Δ S$ is negative?

$H_{2} (g) \to 2 H (g)$

$N_{2} (g) (1 atm) \to N_{2} (g) (8 atm)$

$2 S O_{3} (g) \to 2 S O_{2} (g) + O_{2} (g)$

$C_{(d iam o n d)} \to C_{(g r a p hi t e)}$

Processes $(A)$ and $(C)$ take place with the increase of no. of moles of gaseous species and hence the disorder or entropy increases. $(B)$ on increasing pressure, disorder or randomness decreases and so also the entropy $(D)$ is endothermic process and $Δ S$ is positive.

Q. For which of the following processes value of ΔS is negative?

H2​(g)→2H(g)

N2​( g)(1 atm)→N2​( g)(8 atm)

2SO3​(g)→2SO2​(g)+O2​(g)

C(diamond)​→C(graphite)​