3. Thermodynamic data; reaction direction. Selenium is a constituent in many California soils but can become toxic to wildlife (e.g., Kesterson Valley Wildlife Refuge) in certain of its forms. One of its acidic forms undergoes the following reaction: H₂SO3 (aq) HSCO, (aq) + H+ (aq) You find the following thermodynamic constants: Species H₂SCO, (aq) HSeOy (aq) H (aq) AG (kJ/mol) AH? (kJ/mol) -426.2 -507.5 -431.5 -514.5 0.0 0.0 a. Calculate AGº for the chemical reaction above. b. Calculate the equilibrium constant at 25 °C for the reaction above. C. For the following system composition: [H₂SO3] = 10-³ M [HSeO3-] = 10-³ M pH = 4 Determine whether the system is (a) at equilibrium, (b) moving toward products, or (c) moving toward reactants. Show work to justify your answer.

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3. Thermodynamic data; reaction direction. Selenium is a constituent in many California soils but can
become toxic to wildlife (e.g., Kesterson Valley Wildlife Refuge) in certain of its forms. One of its acidic
forms undergoes the following reaction:
H₂SO3 (aq) →→ HSeO3¯ (aq) + H+ (aq)
You find the following thermodynamic constants:
Species
H₂SO3 (aq)
C.
HSeO3(aq)
H (aq)
AG (kJ/mol) AH? (kJ/mol)
-426.2
-507.5
-431.5
-514.5
0.0
0.0
a. Calculate AGⓇ for the chemical reaction above.
b. Calculate the equilibrium constant at 25 °C for the reaction above.
For the following system composition:
[H₂SO3] = 10-³ M
[HSeO3-] = 10-³ M
pH = 4
Determine whether the system is (a) at equilibrium, (b) moving toward products, or (c) moving toward
reactants. Show work to justify your answer.
Transcribed Image Text:3. Thermodynamic data; reaction direction. Selenium is a constituent in many California soils but can become toxic to wildlife (e.g., Kesterson Valley Wildlife Refuge) in certain of its forms. One of its acidic forms undergoes the following reaction: H₂SO3 (aq) →→ HSeO3¯ (aq) + H+ (aq) You find the following thermodynamic constants: Species H₂SO3 (aq) C. HSeO3(aq) H (aq) AG (kJ/mol) AH? (kJ/mol) -426.2 -507.5 -431.5 -514.5 0.0 0.0 a. Calculate AGⓇ for the chemical reaction above. b. Calculate the equilibrium constant at 25 °C for the reaction above. For the following system composition: [H₂SO3] = 10-³ M [HSeO3-] = 10-³ M pH = 4 Determine whether the system is (a) at equilibrium, (b) moving toward products, or (c) moving toward reactants. Show work to justify your answer.
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