A Chemical engineer is studying the two reactions shown in the table below. In e

Question

A Chemical engineer is studying the two reactions shown in the table below. In each case, he fills a reaction vessel with some mixture of the reactants and products at a constant temperature of 88.0 degree C and constant total pressure. Then, he measures the reaction enthalpy Delta H and reaction entropy Delta S of the first reaction enthalpy Delta H and reaction free energy Delta G of the second reaction. The results of his measurements are shown in the table. Complete the table. That is, calculate Delta G for the first reaction and Delta S for the second. (Round your answer to zero decimal places). Then, decide whether, under the conditions the engineer has set up, the reaction is spontaneous because the system is at equilibrium.

Explanation / Answer

Reaction,

Al2O3(s) + 3H2(g) --> 2Al(s) + 3H2O(g)

dG = dH - TdS

      = 951 - (273 + 88) x 2.577

      = 20.703 kJ

Which is spontaneous in,

-the reverse reaction

Reaction,

2H2(g) + O2(g) --> 2H2O(g)

dS = (dH - dG)/T

     = (-484 + 25) x 1000/361

     = -1271.47 J/K

Which is spontaneous

-this reaction

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