In which case change in entropy is negative ?

Question

In which case change in entropy is negative ? (A) Sublimation of solid to gas (B) 2H(g) arrow H2(g) (C) Evaporation of water (D) Expansion ofa gas at constant temperature

Tardigrade Admin · Accepted Answer

- H 2 P (ℓ) leftharpoons H 2 O ( v ), Δ S >0 - Expansion of gas at constant temperature, Δ S >0 - Sublimation of solid to gas, Δ S>0 - 2 H ( g ) longrightarrow H 2( g ), Δ S <0(∵ Δ ng <0)

Q. In which case change in entropy is negative ?

Sublimation of solid to gas

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

Evaporation of water

Expansion ofa gas at constant temperature

- $H_{2} P (ℓ) ⇌ H_{2} O (v), Δ S > 0$
- Expansion of gas at constant temperature, $Δ S > 0$
- Sublimation of solid to gas, $Δ S > 0$
- $2 H (g) ⟶ H_{2} (g), Δ S < 0 (∵ Δ n g < 0)$