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March 28, 2017

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Consider the following reaction:
CaCO3(s)→CaO(s)+CO2(g).
Estimate ΔG∘ for this reaction at each of the following temperatures. (Assume that ΔH∘ and ΔS∘ do not change too much within the given temperature range.)

A) 310K
B) 1070K
C) 1470K

And is A,B,C spontaneous or non spontaneous?

  • Chemistry - ,

    dHorxn = (n*dHoformation producs) - (n*dHoreactants)

    dSo rxn = (n*dSo formation products( - (n*dSo formation reactants)

    dGrxn = dHrxn - TdSrxn
    dG<0 spontaneous
    dG=0 equilibrium
    dG>0 not spontaneous.

  • Chemistry - ,

    Im still confused..

    is n 2?

    and if so would it look like this for A

    dHorxn=(2*2.84)-(2*-.227)??

  • Chemistry - ,

    n stands for number of mols. It is 1 for CaO, 1 for CaCO3, and 1 for CO2.
    Look up dHo formation CO2, CaO, and CaCO3. Calculate dHo reaction.

    Look up dSo for CO2, CaO, and CaCO3. Calculate dSo reaction.

    Then dGorxn = dHorxn - TdSorxn

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