Which is spontaneous?   this reaction

Chemistry: The Molecular Science
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Author:John W. Moore, Conrad L. Stanitski
Publisher:John W. Moore, Conrad L. Stanitski
Chapter16: Thermodynamics: Directionality Of Chemical Reactions
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A chemical engineer is studying the two reactions shown in the table below.

In each case, he fills a reaction vessel with some mixture of the reactants and products at a constant temperature of 

144.0°C

 and constant total pressure. Then, he measures the reaction enthalpy 

ΔH

 and reaction entropy 

ΔS

 of the first reaction, and the reaction enthalpy 

ΔH

 and reaction free energy 

ΔG

 of the second reaction. The results of his measurements are shown in the table.

Complete the table. That is, calculate 

ΔG

 for the first reaction and 

ΔS

 for the second. (Round your answer to zero decimal places.) Then, decide whether, under the conditions the engineer has set up, the reaction is spontaneous, the reverse reaction is spontaneous, or neither forward nor reverse reaction is spontaneous because the system is at equilibrium.



→+C3H8g5O2g+3CO2g4H2Ol
=ΔH−2220.kJ
=ΔS−5322.JK
=ΔGkJ
Which is spontaneous?
 
this reaction
 
 
the reverse reaction
 
 
neither
 
→+MgCl2sH2Ol+MgOs2HClg
=ΔH140.kJ
=ΔSJK
=ΔG−23.kJ
Which is spontaneous?
 
this reaction
 
 
the reverse reaction
 
 
neither
 
 
 
 
 
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