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Quiz3 2-12-07

# Quiz3 2-12-07 - Quiz 3 Formulas G = H TS Grxn =...

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Quiz # 3 2-12-07 Formulas Δ G = Δ H - T Δ S Δ G rxn = ∑Δ G f 0 (products) - ∑Δ G f 0 (reactants) Δ G = Δ G 0 + RT ln(Q)

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1.Ammonia is synthesized from N 2 and H 2 N 2 (g) + 3H 2 (g) 2NH 3 (g) Δ G f 0 for NH 3 (g) is -17kJ/mol. What is the value of Δ G rxn 0 for the reaction shown above? a)+17 kJ/mol b)-17 kJ/mol c)+34 kJ/mol d)-51 kJ/mol e)None of the above
2. A reaction that describes photosynthesis and the Δ G f 0 values of reactants and products are 6 CO 2 (g) + 6 H 2 O(l) C 6 H 12 O 6 (s) + 6 O 2 (g) -237 kJ/mol -395 kJ/mol 0 -911 kJ/mol Δ G f 0 H 2 O(l) CO 2 (g) O 2 (g) C 6 H 12 O 6 (s) This information indicates that the value of Δ G 0 for the reaction is a) Positive b) Negative c) Zero d) Can’t be determined from the information given

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3. Why do plants manufacture O 2 (g) during photosynthesis a) They need it to manufacture leaves b) To provide it for animals who breathe it c) It is a byproduct formed when water is used as a source of electrons and protons for CO 2 reduction d) It is formed in a spontaneous reaction of CO

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