Question

ΔG(T,P)= ΔG°(T)+RTlnQ(T,P)

-RTlnK(T)=ΔG°(T)=ΔH°(T)-TΔS°(T)

H2(g)+1/2 S2 (g) <=> H2S(g)

1. determine the value of the standard enthalpy change of the reaction ΔH°and its uncertainty

2. determine the value of the standard entropy change of the reaction ΔS° and its uncertainty

3. give the value of the equilibrium constant at 1000°C

T(°c) = 750 830 945 1065 1089 1132 1200 1264 1394

K = 106.2 45.0 23.5 8.9 8.2 6.2 5.0 3.2 1.6

Answer #1

** H2(g)+1/2 S2 (g)
<=> H2S(g)**

**DH0rxn = DH0H2S - (1/2*DH0s2 + DH0H2)**

** = (-20.6) - (1/2*0
+ 0)**

** = -20.6
kj/mol**

**DS0rxn = S0H2S - (1/2*S0S2+S0H2)**

** = (205.7) -
(32.054+130.6)**

** = 43.046
j/k.mol**

**DG0 = DH0-TDS0**

** =
(-20.6*10^3)-1273.15*43.046**

** = -75.404 kj/mol**

**DG0 = - RTlnk**

**-75404 = -8.314*1273.15lnk**

** k = 1.241*10^3**

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