Determine the standard molar entropy of formation?

Determine the standard molar entropy of formation at 298K for each of the following (recall what a formation reaction is from our discussion of heats of formation):

    Sfo J/mol-K

H2(g)   

H2O(g)  

NH3(g)  

O3(g)   

I2(g)

3 Answers

  • To get the entropy of formation you have to use your table of standard entropy, heat and energies.

    H2(g) is zero

    for H2O(g) you have to use the reaction H2(g)+(1/2)O2(g)--> H2O(g)

    you take the standard entropy of products minus reactants and you get -44.385

    for NH3(g) you use the reaction (1/2)N2(g) + (1/3) H2(g)--> NH3(g) you do the same as before take the entropy of products minus reactants and you end up with -99.3

    for O3(g) you use the reaction (3/2)O2(g)-->O3(g) and you end up with -68.725

    I can't figure out the last one sorry!!

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    Determine the standard molar entropy of formation?

    Determine the standard molar entropy of formation at 298K for each of the following (recall what a formation reaction is from our discussion of heats of formation):

        Sfo J/mol-K
    
    H2(g)   
    
    H2O(g)  
    
    NH3(g)  
    
    O3(g)   

    I2(g)

  • Standard Entropy Of Formation

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