## Textbook 9.67

$\Delta G^{\circ}= \Delta H^{\circ} - T \Delta S^{\circ}$

$\Delta G^{\circ}= -RT\ln K$

$\Delta G^{\circ}= \sum \Delta G_{f}^{\circ}(products) - \sum \Delta G_{f}^{\circ}(reactants)$

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Tim Foster 2A
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### Textbook 9.67

This problem wants us to find the range over which each reaction will be spontaneous and lists a few reactions. My calculations are all slightly off for some reason; am I correct in that to solve this problem you need to use the difference in enthalpy and entropy of the products and reactants to find the reaction's entropy and enthalpy, and then plug these values into the Delta\ G = Delta\ H - T Delta\ S equation to find T?

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### Re: Textbook 9.67

Hi, Tim,
Yes, your solution strategy is correct. Due to a large number of calculations involved in this problem, you might have rounded up your answers too much and thus your answers are a bit off.
Don't forget that you have to make deltaG = 0 to find the cutoff temperature at which a reaction becomes spontaneous!

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