Question
Asked Nov 5, 2019
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17. Given the Ks for the reactions, calculate AG°S. Values given for 298 K.
Kc 50.5
a. H2+ 12g)2 H)
b. 2 NH3(g)N2(9) + 3 H2(g)
c. 2 NO 2(g)
Kc 0.104
Kc 4.72
N204(g)
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17. Given the Ks for the reactions, calculate AG°S. Values given for 298 K. Kc 50.5 a. H2+ 12g)2 H) b. 2 NH3(g)N2(9) + 3 H2(g) c. 2 NO 2(g) Kc 0.104 Kc 4.72 N204(g)

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Expert Answer

Step 1

(a)

ΔGos can be calculated as follows,

2 HI
(g)
H,
Kc 50.5
2(g)
AG°S RT In K
=-(8.314 J/mo. K)(298 K) In (50.5)
=-9.7x 10 J/mol = -9.7 kJ/mol
Hence, AG°S for the reaction is - 9.7 kJ/mol
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2 HI (g) H, Kc 50.5 2(g) AG°S RT In K =-(8.314 J/mo. K)(298 K) In (50.5) =-9.7x 10 J/mol = -9.7 kJ/mol Hence, AG°S for the reaction is - 9.7 kJ/mol

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Step 2

(b)

ΔGos can be calculate...

Kc 0.104
2 ΝΗ,
3(g)
3H2
'2(g)
2 NH
N,
AG°S -RTln K
=-(8.314 J/mol. K)(298 K ) In (0.104)
= 5.6x 103 J/mol = 5.6 kJ/mol
Hence, AG°s for the reaction is 5.6 kJ/mol
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Kc 0.104 2 ΝΗ, 3(g) 3H2 '2(g) 2 NH N, AG°S -RTln K =-(8.314 J/mol. K)(298 K ) In (0.104) = 5.6x 103 J/mol = 5.6 kJ/mol Hence, AG°s for the reaction is 5.6 kJ/mol

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