In each he fills a reaction vessel with some mixture of the reactants and produc

Question

In each he fills a reaction vessel with some mixture of the reactants and products at a constant temperature of 149.0 °C and constant total pressure Then, he measures the reaction enthalpy H and reaction entropy LAS of the first reaction, and the reaction enthalpy H and reaction free energy G of the second reaction, The results of his measurements are shown in the table Complete the table. That is, calculate AG for the first reaction and AS 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, the reverse reaction is spontaneous, or neither forward nor reverse reaction is spontaneous because the system is at equilibrium AH 1207. S = 2881 4PCI3(g) P4(g) + 6Cl2(g) Which is spontaneous? O this reaction O the reverse reaction O neither A =-1353. kJ AS, = = 10, k Which is spontaneous? O this reaction O the reverse reaction O neither 2CH,OH (g) + 3O2(g) 2CO2(g) + 4H20(g)

Explanation / Answer

1)

deltaH = 1207.0 KJ

deltaS = 2881 J/K

= 2.881 KJ/K

T= 149.0 oC

= (149.0+273) K

= 422 K

we have below equation to be used:

deltaG = deltaH - T*deltaS

deltaG = 1207.0 - 422.0 * 2.881

deltaG = -8.782 KJ

Answer: -9 KJ

Since delta G is negative, this reaction is spontaneous

Answer: this reaction

2)

deltaG = 10 KJ

deltaH = -1353 KJ

T= 149.0 oC

= (149.0+273) K

= 422 K

we have below equation to be used:

deltaG = deltaH - T*deltaS

10.0 = -1353.0 - 422.0 *deltaS

deltaS = -3.2299 KJ/K

deltaS = -3230 J/K

Answer: -3230 J/K

Since delta G is positive, reverse reaction is spontaneous

Answer: reverse reaction

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