Consider the chemical reaction and thermochemical information and initial partia

Question

Consider the chemical reaction and thermochemical information and initial partial pressures of the reaction components given below:



C2H6(g) + Cl2(g) C2H5Cl(g) + HCl(g)

Determine G (in kJ) for this reaction at 335.03 K. Assume H°f and S° do not vary as a function of temperature. Report your answer to two decimal places in standard notation (i.e. 123.45 kJ).

Hf° (kJ/mol)     S° (J mol-1 K-1)     P (atm) C2H5Cl -112.20 276.00 0.838 HCl -92.31 186.90 0.732 C2H6 -83.85 229.20 7.08 Cl2 0.00 223.08 3.28

Explanation / Answer

DH0= DHf0 products- DHf0 reagents= (-112.2 -92.31) - (-83.85 + 0)= -120.66 kJ/mol

DS0= DS0 products - DS0 reagents= 276 + 186.9 -(229.2 + 223.08)= 10.62 J/mol K

DG0= DH0 -¨DS0 x T = -120.66 - 10.62x10-3 x 335.03K= -124.22 kJ/mol

DG= DG0 + RT Ln Q

DG= -124.22 + 8.314x10-3x335.03 Ln (0.838 x 0.732)/(7.08 x 3.28) = -134.34 kJ

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