NH4HS total pressure 0.658 atm 25℃ free energy

NH4HS total pressure 0.658 atm 25℃ free energy

 

 

Ammonium hydrogen sulfide, a stink bomb ingredient,

decomposes to ammonia and hydrogen sulfide.

NH4HS(s) ⇌ NH3(g) + H2S(g)

Calculate the standard free energy of formation of NH4HS(s) at 25℃

if the total pressure resulting from NH4HS

placed in an evacuated container is 0.658 atm at 25℃.

 

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ICE 도표를 작성하면,

 

 

 

 

NH4HS(s) ⇌ NH3(g) + H2S(g)

평형에서, ...... x ............ x

 

Kp = (P_NH3) (P_H2S) = (x) (x)

 

 

 

x + x = 0.658 atm

 

x = 0.658 / 2 = 0.329 atm

 

 

 

Kp = (0.329)^2 = 0.108

 

 

 

ΔG° = –RT lnK

( 참고 https://ywpop.tistory.com/10336 )

 

= –(8.314) (273.15+25) ln(0.108)

= +5517 J/mol

= +5.52 kJ/mol

 

 

 

답: +5.52 kJ/mol

 

 

 

 

[ 관련 예제 https://ywpop.tistory.com/22793 ]

NH4HS(s) ⇌ NH3(g) + H2S(g) Kp = 0.108 at 25℃

 

 

 

[키워드] NH4HS(s) ⇌ NH3(g) + H2S(g) 기준문서