For the reaction below, the free energy (ÎG) is determined to be 118 kJ given the conditions in the table below (NOT equilibrium conditions). Determine the thermodynamic equilibrium constant (Keq) for the reaction at 25 o C.

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

Substance H2S H2 S2

Partial Pressure (atm) 2.50 .050 .010

Temperature 25oC 25oC 25oC

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Beverley SmithLv2

13 Dec 2019

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Related questions

Use data from the table below to calculate the equilibrium constants at 25?C for each reaction.

Standard Thermodynamic Quantities for Selected Substances
at 25?C

Substance	?H?f(kJ/mol)	?G?f(kJ/mol)	S?(J/mol?K)
H2(g)	0	0	130.7
N2(g)	0	0	191.6
O2(g)	0	0	205.2
NO(g)	91.3	87.6	210.8
CO(g)	-110.5	-137.2	197.7
CO2(g)	-393.5	-394.4	213.8
H2S(g)	-20.6	-33.4	205.8
S2(g)	128.6	79.7	228.2

Part A

2NO(g)+O2(g)?2NO2(g)

Express your answer using two significant figures.

Part B

2H2S(g)?2H2(g)+S2(g)

Express your answer using two significant figures.

The following reaction has an equilibrium constant KP equal to 2.4Ã10-4 at 1073 K..Determine the following at this
temperature.
2H2S(g) â 2H2(g) + S2(g)
(a) If the reaction favor reactants or products?
(b) KC for the reaction 2H2S(g) â 2H2(g) + S2(g)?
(c) What is KP for the reaction 3H2(g) + 3/2S2(g) â 3H2S(g) ?
(d) Determine the reaction quotient for a mixture consisting of 0.212 atm of H2S, 0.677 atm of H2 and 1.14 atm of S2. In which direction will the reaction proceed to reach equilibrium ?
(e) If the equilibrium partial pressures of H2S and S2 are respectively 3.14 atm and 0.107 atm, what is the equilibrium partial pressure of H2 (in atm) ?

The equilibrium reaction: 2NOBr (g) â 2NO(g) + Br2(g) is endothermic. For each of the following changes indicate if
the concentration of NOBr would decrease, increase, or remain the same {1 point each}
(a) Some Br2 was removed from the reaction mixture â decrease, â increase, â remain the same
(b) The volume of the reaction vessel was increased â decrease, â increase, â remain the same
(c) The temperature of the reaction was increased â decrease, â increase, â remain the same
(d) A catalyst was added â decrease, â increase, â remain the same

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