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Week 2 Quiz

Quiz by Kari Stone

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8 questions
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  • Q1

    Which of the following processes have a ΔS > 0?

    2 NH3(g) + CO2(g) →  NH2CONH2(aq) + H2O(l)

    sodium chloride dissolves in pure water

    2 HBr(g) → H2(g) + Br2(l)

    lithium fluoride forms from its elements

    300s
  • Q2

    Consider the following reaction at constant P.  Use the information here to determine the value of ΔSsurr at 298 K.  Predict whether or not this reaction will be spontaneous at this temperature.

     

                N2(g) + 2 O2(g) → 2 NO2(g)            ΔH = +66.4 kJ 

    ΔSsurr = +223 J/K, reaction is spontaneous

    ΔSsurr = +66.4 J/K, reaction is not spontaneous

    ΔSsurr = -223 J/K, reaction is not spontaneous

    ΔSsurr = -66.4 J/K, reaction is spontaneous

    300s
  • Q3

    Consider a reaction that has a positive ΔH and a negative ΔS.  Which of the following statements is TRUE?

    This reaction will be spontaneous at all temperatures.

    This reaction will be nonspontaneous at all temperatures.

    This reaction will be spontaneous only at high temperatures.

    This reaction will be nonspontaneous only at high temperatures.

    300s
  • Q4

    For the following example, identify the following.

     

                H2O (l)  → H2O(s)

    a positive ΔH and a negative ΔS

    a negative ΔH and a positive ΔS

    a positive ΔH and a positive ΔS

    a negative ΔH and a negative ΔS

    300s
  • Q5

    Place the following in order of increasing molar entropy at 298 K. Put in order separated by commas.

     

                CO2       C3H8     SO

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    300s
  • Q6

    Calculate ΔS°rxn (in J/K) for the following reaction.  The S° for each species is shown below the reaction.

     

                                 C2H2(g) + H2(g)  →  C2H4(g)

                                                  

     S°(J/mol∙K)    200.9         130.7         219.3

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    300s
  • Q7

    Given the following equation,

     

                N2O(g)  +  NO2(g)  →  3 NO(g)        ΔG°rxn  = -23.0 kJ

     

    Calculate ΔG°rxn (in kJ) for the following reaction.   

     

                      3N2O(g)  +  3NO2(g)  →  9 NO(g)  

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    300s
  • Q8

    Estimate ΔG°rxn (in kJ) for the following reaction at 449.0 K.

     

                CH2O(g) + 2 H2(g) → CH4(g) + H2O(g)     ΔH°=  -94.9 kJ;  ΔS°= -224.2  J/K

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    300s

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