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Homework 1-problems

# Homework 1-problems - brister(mkb2227 Homework 1...

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brister (mkb2227) – Homework 1 – sutcliffe – (51630) 1 This print-out should have 20 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. Note there are a number of numerical (free response) questions on this assignment. I rec- ommend you use the accurate Kelvin - Cel- sius conversion to help avoid rounding errors. Watch your signs and always see if you can predict a qualitative version of the problem to estimate the sign and possible size of your answer. 001 10.0points If Δ G rxn is positive, then the forward reaction is (spontaneous / nonspontaneous) and K is (less / greater) than one. 1. spontaneous, less 2. None of these; Δ G is not directly related to K . 3. nonspontaneous; less 4. nonspontaneous; greater 5. spontaneous, greater 002 10.0points Knowing only the standard Δ H rxn and Δ S values of each of the different reactions I) Δ H rxn = - 10 J/mol, Δ S = 1000 J/K/mol II) Δ H rxn = 10 J/mol, Δ S = 1000 J/K/mol III) Δ H rxn = - 20 J/mol, Δ S = 1000 J/K/mol IV) Δ H rxn = 40 J/mol, Δ S = - 2000 J/K/mol which will have the highest K eq value? As- sume all reactions are run at 293 K. 1. IV only 2. III only 3. II only 4. I only 5. I and II have equal highest values of K . 6. All four have equal values of K . 7. I, II and III have equal highest values of K . 003 10.0points Note: The ’reaction progress’ axis goes from 100 The figure represents a reaction at 298 K. G A B C D E rxn progress Based on the figure, the standard reaction is 1. nonspontaneous. 2. spontaneous. 004 10.0points A gas-phase reaction has K p = 4 . 46 × 10 20 at 25 C. Calculate Δ G 0 for this reaction.

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