1.Given the following data for the reaction A ® B, determine the activation ener

Question

1.Given the following data for the reaction A ® B, determine the activation energy, Ea, of the reaction.

k (M/s)

T (K)

0.681

500

0.715

1,000

2.05 ´ 10–2 kJ/mol

405 J/mol

6.90 J/mol

48.7 J/mol

9.95 kJ/mol

2. The mechanism for the reaction 2H2O2(aq) ® 2H2O(l) + O2(g) in the presence of I–(aq) is proposed to be:

Step 1: H2O2(aq) + I–(aq) ® H2O(l) + OI–(aq)
Step 2: H2O2(aq) + OI–(aq) ® H2O(l) + O2(g) + I–(aq)
Which of the following species is an intermediate?

I–

H2O2

H2O

OI–

This mechanism has no intermediates.

k (M/s)

T (K)

0.681

500

0.715

1,000

Explanation / Answer

K1   = 0.681M/sec
T1   = 500K
K2    = 0.715M/sec
T2    = 1000K
logK2/K1   = Ea/2.303R[1/T1 -1/T2]
log0.715/0.681   = Ea/2.303*8.314 [1/500 -1/1000]
0.0211          = Ea/19.147[0.002-0.001]
Ea               = 0.0211*19.147/0.001   = 405J/mole

b. 405 J/mol>>>>>answer

2. Step 1: H2O2(aq) + I–(aq) ----------> H2O(l) + OI–(aq)
Step 2: H2O2(aq) + OI–(aq) --------------->H2O(l) + O2(g) + I–(aq)

    OI^- is intermediate

d. OI–   >>>>>answer

Related Questions

Navigate

• Browse (All)
• Browse 1
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.