Given the following data for the reaction A rightarrow B, determine the activati

Question

Given the following data for the reaction A rightarrow B, determine the activation energy. E of the reaction to three significant figures. 6.89 J/mol 57.3 J/mol 374 J/mol 39.9 J/mol 54.4 J/mol Which of the following is/are equal once equilibrium is established? the rates of the forward and reverse reactions the concentrations of reactant and products the time that a particular atom or molecule spends as a reactant and product the rate constants of the forward and reverse reactions all of the above are equal Indicate which of the following has the lowest standard molar entropy (S degree). H_2 O(s) CH_3CH_2 OH(e) CH_4(g) He(g) Na(s)The standard molar entropy of lead(II) bromide (PbBr_2) is 161 J/mol middot K. What is the entropy of 2.45g of PbBr_2? +161J/K 0 J/K +1.07 J/K -1.07 J/K -161 J/K

Explanation / Answer

8. logK2/K1    = Ea/2.303R [1/T1 -1/T2]

log0.739/0.73 = Ea/2.303*8.314[1/250 -1/450]

0.00532          = Ea/19.147 (0.004-0.0022)

Ea                   = 0.00532*19.147/0.0018   = 57.4J/mole

9. e all othe above

10. e. Na(s)   solids are lower entropy

11. 367g -----------------> 161j/mole-K

     2.45g --------------> 161*2.45/367   = 1.07J/K >>> answer C

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