Which of the following species is the weakest acid? HA (Ka = 10^-2) HB (Ka = 10^

Question

Which of the following species is the weakest acid? HA (Ka = 10^-2) HB (Ka = 10^-4) HC (Ka = 10^-6) HD (Ka = 10^-8) When delta G_rxn^0 is less than zero, the value of K is less than zero between zero and one greater than 1 infinite For question 9-10 consider the reaction below: CO_(g) + O_2(g) rightarrow CO_2(g) (unbalance) Calculate the change in the standard entropy of the system. delta S degree - 173 J/mol K +173 J/mol K -189 J/mol K +189 J/mol K What is the equilibrium constant. K. at 25 degree C - 1.12 times 10^45 1.26 times 10^90 1.23 7.96 times 10^-91

Explanation / Answer

7. Weakest acid would have lowest Ka,

d. HD (Ka = 10^-8)

8. With dGo < 0, K would be,

c. greater than 1

9. dSo for the reaction would be, [use dSo = dSoproducts - dSoreactants]

a. -173 J/mol-K

10. Equilibium constant K for the reaction, [use dGo = -RTlnK]

b. 1.26 x 10^90

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