What are the signs of the entropy charge (+ or - ) in the following :- I: A liquid crystallises into a solid II: Temperature of a crystalline solid is raised from 0 K to 115 K III: 2 NaHCO 3( s ) arrow Na 2 CO 3( s )+ CO 2( g )+ H 2 O ( g ) IV: H 2( g ) arrow 2 H ( g )

Question

What are the signs of the entropy charge (+ or - ) in the following :- I: A liquid crystallises into a solid II: Temperature of a crystalline solid is raised from 0 K to 115 K III: 2 NaHCO 3( s ) arrow Na 2 CO 3( s )+ CO 2( g )+ H 2 O ( g ) IV: H 2( g ) arrow 2 H ( g ) (A) I - (-) , II - (+) , III - (+), IV - (+) (B) I - (-) , II - (-) , III - (-), IV - (+) (C) I - (-) , II - (+) , III - (-), IV - (+) (D) I - (+) , II - (-) , III - (-), IV - (-)

Tardigrade Admin · Accepted Answer

(I) Liquid longrightarrow solid Δ S <0 (II) Solid ( T 1) longrightarrow Solid ( T 2) Δ S >0 ( T 2> T 1) (III) 2 NaHCO 3( s ) xrightarrowΔ Na 2 CO 3( s )+ CO 3( g )+ H 2 O ( g ) Δ S >0 (IV) H 2( g ) longrightarrow 2 H ( g ) Δ S >0

Q. What are the signs of the entropy charge $(+$ or $-$ ) in the following :-
I : A liquid crystallises into a solid
II : Temperature of a crystalline solid is raised from $0 K$ to $115 K$
III : $2 N a H C O_{3} (s) \to N a_{2} C O_{3} (s) + C O_{2} (g) + H_{2} O (g)$
IV : $H_{2} (g) \to 2 H (g)$

I - (-) , II - (+) , III - (+), IV - (+)

I - (-) , II - (-) , III - (-), IV - (+)

I - (-) , II - (+) , III - (-), IV - (+)

I - (+) , II - (-) , III - (-), IV - (-)

(I) Liquid $⟶$ solid $Δ S < 0$
(II) Solid $(T_{1}) ⟶$ Solid $(T_{2}) Δ S > 0$
$(T_{2} > T_{1})$
(III) $2 N a H C O_{3} (s) Δ N a_{2} C O_{3} (s) + C O_{3} (g) + H_{2} O (g) Δ S > 0$
(IV) $H_{2} (g) ⟶ 2 H (g) Δ S > 0$

Q. What are the signs of the entropy charge (+ or − ) in the following :- I : A liquid crystallises into a solid II : Temperature of a crystalline solid is raised from 0K to 115K III : 2NaHCO3​(s)→Na2​CO3​(s)+CO2​(g)+H2​O(g) IV : H2​(g)→2H(g)