1. Tardigrade
  2. Question
  3. Chemistry
  4. 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 )

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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 : $2 NaHCO _{3}( s ) \rightarrow Na _{2} CO _{3}( s )+ CO _{2}( g )+ H _{2} O ( g )$
IV : $H _{2}( g ) \rightarrow 2 H ( g )$

Thermodynamics

Solution:

(I) Liquid $\longrightarrow $ solid $\Delta S <0$
(II) Solid $\left( T _{1}\right) \longrightarrow $ Solid $\left( T _{2}\right) \,\,\,\,\Delta S >0$
$\left( T _{2}> T _{1}\right)$
(III) $2 NaHCO _{3}( s ) \xrightarrow{\Delta} Na _{2} CO _{3}( s )+ CO _{3}( g )+ H _{2} O ( g )\,\,\,\, \Delta S >0$
(IV) $H _{2}( g ) \longrightarrow 2 H ( g ) \,\,\,\,\Delta S >0$