![]() Since 314.1 J K -1 mol -1 is of the same order of magnitude and sign as 400 J K -1 mol -1, we are reasonably confident our answer is plausible.#color(white)(mmmmmmmmm)"C"_3"H"_8"(g)" + "5O"_2"(g)" → "3CO"_2"(g)" + "4H"_2"O(l)"# Next we can perform a "rough" calculation to make sure our value is in the "right ball park": The balanced chemical equation has 3 moles of gas on the left hand side and 2 + 4 = 6 moles of gas on the right hand side, that is, we expect the entropy of the system to increase (ΔS° (reaction) will be positive).
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