5. Complete the table below for the four different combinations of enthalpy and

Question

5. Complete the table below for the four different combinations of enthalpy and entropy. G at low T | AG at high T | Is the spontaneity (circle one) (circle one) temperature dependent? (circle one) Yes No Yes No Yes No Yes No 0 0 6. Write the complete balanced formation reaction for theobromine (CHeN402), a compound found in chocolate. Hint: The standard state for carbon is graphite. Use the given H·S" and Gf values to calculate the G'm at 25°C for the following reaction two different ways. First with the H'm and AS"m to get AG'm and then with Gis to get G'm. Compare your results. 7. | cs2(g) + 1 2H20(a 202(g) 2503(g) | CH4(g) + AH° (kJmol) 117 S (J/mol K) 238 AG (kJ/lmol)67 -286 70 -237 75 186 51 -396 205 257 -371

Explanation / Answer

    Cs2(g) + 2H2O(l) + 2O2(g) ---> CH4(g) + 2SO3(g)

DH0rxn = (1*-75+2*-396)-(1*117+2*-286+2*0) = -412 kj

DS0rxn = (1*186+2*257)-(1*238+2*70+2*205) = -88 kj

DG0 = dH0-TDS0

    = -412 - (298*-88*10^-3)

    = -385.78 kj/mol

DG0rxn = (1*-51+2*-371)-(1*67+2*-237+2*0) = -386 kj

onlysmall change in the results, = -386 - (-385.78) = -0.22 kj

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