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Category > Chemistry Posted 27 Apr 2017 My Price 10.00

positive or negative

2) Is the entropy, â–³S, positive or negative for the following process?

Assembling a jigsaw puzzle.

a.positive

b.negative

 

 

3) Is the entropy, â–³S, positive or negative for the following process?

Constructing a miniature log house from Legos® building logs

a.positive

b.negative

 

4) Consider the reaction H2 (g) + Br2 (l) → 2 HBr (g).

If △S = 114JKmol, what is △S for the reverse reaction, 2 HBr (g) → H2 (g) + Br2 (l) ?

a.ΔS = - 114 kJ/K•mol for the reverse reaction.

b.ΔS = - 300 kJ/K•mol for the reverse reaction.

c.ΔS = - 165 kJ/K•mol for the reverse reaction.

d.ΔS = - 10 kJ/K•mol for the reverse reaction.

 

5) Consider the reaction H2 (g) + Br2 (l) → 2 HBr (g).

Which would you predict to be spontaneous based only on â–³S, the first reaction given or the reverse reaction?

a.The first reaction is more likely to be spontaneous.

b.The reverse reaction is more likely to be spontaneous.

c.Neither of them is spontaneous. 

 

6) The chemical equation for producing hydrogen from the reaction between water and carbon is as follows:

C (s) + H2O (l) → CO (g) + H2 (g). For this reaction, △H = 131 k/Jmol, and △S = 134J/Kmol.

  1. Calculate the free energy, â–³G, for this reaction when the temperature is 305K.
  2. Is the reaction spontaneous?

 

7) When chloroform changes phase from a liquid to a gas, â–³H = 29.2k/Jmol, and â–³S = +75.7J/Kmol.

  1. Calculate the free energy, â–³G, for this reaction when the temperature is 125oC.
  2. Is the reaction spontaneous?

Answers

SuperTutor
(15)
Status NEW Posted 27 Apr 2017 07:04 AM My Price 10.00

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