Given the values of Delta and T below, determine Delta S univ Delta H_rxn degree

Question

Given the values of Delta and T below, determine Delta S univ Delta H_rxn degree = -87 kJ, Delta S_rxn = -143 J/K, T = 308 K Express your answer using two significant figures. Delta H_rxn degree = -87 Delta S_rxn = -143 J/K, T = 750 K Express your answer using one significant figure. Delta H_rxn degree = -87 kJ, Delta S_rxn = -143 J/K, T = 308 K. Express your answer using two significant figures. Delta H_rxn degree = -87 kJ, Delta S_rxn = -143 J/K, T = 401 K. Express your answer using two significant figures.

Explanation / Answer

Part A) S(universe) = - Hrxn/T+ Srxn

= 87000 /308 J/K +(-143 J/K) =282 -143 J/K= +139 J/K (spontaneous)

Part B)  S(universe) = - Hrxn/T+ Srxn

= 87000 /750 J/K +(-143 J/K) =116 J/k - 143 J/K = - 27 J/K (non-spontaneous)

Part C)  S(universe) = - Hrxn/T+ Srxn

= - 87000 /308 J/K +(-143 J/K) =-282 J/K -143 J/K = - 425 J/K (non-spontaneous)

Part D)  S(universe) = - Hrxn/T+ Srxn

=87000 /401 J/K +(+143 J/K) =216 +143 J/K = + 359 J/K (spontaneous)

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