It should be true that the way a reaction is written shouldn't affect the outcome of a thermochemical analysis. For example, But what if we wrote it this way (2× larger)? H₂O(g) → H2(g) + 1/2O2(g) Amount at equilibrium Mole fractions we analyzed: 2H₂O(g) → 2H2(g) + O2(g) Would the extent of the reaction (a) change? a. To answer this question, first re-derive the mole fraction table using the 2x equation: H₂O 0₂ H₂ 2na 2(1-α) (2 + a) b. Now rederive Kx in terms of a and set it equal to 8.581 × 10-4¹ to solve for a. 4.q³ (2+a)²-(2-2a) c. Your a is much larger than before! However, if you used Kx = 7.36 x 10-81, you would have found the same a=2.451×10-27 as before. Why is it that the value of the equilibrium constant appears to have changed from 8.581 x 10-4¹ to 7.36 × 10-81? . Hint: A.G° = RT · In(K), which means that the answer isn't so much something is wrong with K, rather its A,Gº.

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It should be true that the way a reaction is written shouldn't affect the outcome of a
thermochemical analysis. For example,
But what if we wrote it this way (2× larger)?
H₂O(g) → H2(g) + 1/2O2(g)
Amount at equilibrium
Mole fractions
we analyzed:
2H₂O(g) → 2H2(g) + O2(g)
Would the extent of the reaction (a) change?
a. To answer this question, first re-derive the mole fraction table using the 2× equation:
H₂O
0₂
H₂
2na
2(1-x)
(2 + a)
b. Now rederive Kỵ in terms of a and set it equal to 8.581 x 10-41 to solve for a.
4-α³
(2+a)²-(2-2a)
c. Your a is much larger than before! However, if you used Kx
= 7.36 x 10-81,
you would have found the same a=2.451×10-27 as before. Why is it that the value of the
equilibrium constant appears to have changed from 8.581 x 10-41 to 7.36 x 10-81?
Hint: A.Gº = -RT · In(K), which means that the answer isn't so much something is wrong with
K, rather its A.Gº.
Transcribed Image Text:It should be true that the way a reaction is written shouldn't affect the outcome of a thermochemical analysis. For example, But what if we wrote it this way (2× larger)? H₂O(g) → H2(g) + 1/2O2(g) Amount at equilibrium Mole fractions we analyzed: 2H₂O(g) → 2H2(g) + O2(g) Would the extent of the reaction (a) change? a. To answer this question, first re-derive the mole fraction table using the 2× equation: H₂O 0₂ H₂ 2na 2(1-x) (2 + a) b. Now rederive Kỵ in terms of a and set it equal to 8.581 x 10-41 to solve for a. 4-α³ (2+a)²-(2-2a) c. Your a is much larger than before! However, if you used Kx = 7.36 x 10-81, you would have found the same a=2.451×10-27 as before. Why is it that the value of the equilibrium constant appears to have changed from 8.581 x 10-41 to 7.36 x 10-81? Hint: A.Gº = -RT · In(K), which means that the answer isn't so much something is wrong with K, rather its A.Gº.
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