The balanced chemical reaction for the formation of ammonia from its elements is N 2 + 3 H 2 ( g ) ⇌ 2NH 3 ( g ) (a) What is Δ rxn G ° for this reaction? (b) What is Δ rxn G for this reaction if all species have a partial pressure of 0.500 bar at 25 ° C ? Assume that the fugacities are equal to the partial pressures.
The balanced chemical reaction for the formation of ammonia from its elements is N 2 + 3 H 2 ( g ) ⇌ 2NH 3 ( g ) (a) What is Δ rxn G ° for this reaction? (b) What is Δ rxn G for this reaction if all species have a partial pressure of 0.500 bar at 25 ° C ? Assume that the fugacities are equal to the partial pressures.
Solution Summary: The author explains the Gibbs free energy for a reaction when reactants and products are present in their standard states of pressure, forms, and concentration.
The balanced chemical reaction for the formation of ammonia from its elements is
N
2
+
3
H
2
(
g
)
⇌
2NH
3
(
g
)
(a) What is
Δ
rxn
G
°
for this reaction? (b) What is
Δ
rxn
G
for this reaction if all species have a partial pressure of
0.500
bar
at
25
°
C
? Assume that the fugacities are equal to the partial pressures.
Definition Definition Number that is expressed before molecules, ions, and atoms such that it balances out the number of components present on either section of the equation in a chemical reaction. Stoichiometric coefficients can be a fraction or a whole number and are useful in determining the mole ratio among the reactants and products. In any equalized chemical equation, the number of components on either side of the equation will be the same.
Chloroform, long used as an anesthetic and now considered carcinogenic, has a heat of vaporization of 31.4 kJ/mol. During vaporization, its entropy increases by 94.2 J/mol.K. Therefore, select the alternative that indicates the temperature, in degrees Celsius, at which chloroform begins to boil under a pressure of 1 atm.
A) 28
B) 40
C) 52
D) 60
E) 72
If we assume a system with an anodic overpotential, the variation of n as a function
of current density:
1. at low fields is linear 2. at higher fields, it follows Tafel's law
Obtain the range of current densities for which the overpotential has the same value
when calculated for 1 and 2 cases (maximum relative difference of 5% compared to
the behavior for higher fields).
To which overpotential range does this correspond?
Data: i = 1.5 mA cm², T = 300°C, B = 0.64, R = 8.314 J K1 mol-1 and F = 96485 C mol-1.
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The Laws of Thermodynamics, Entropy, and Gibbs Free Energy; Author: Professor Dave Explains;https://www.youtube.com/watch?v=8N1BxHgsoOw;License: Standard YouTube License, CC-BY