In a study of the decomposition of hydrogen iodide on a gold surface at 150 c th

Question

In a study of the decomposition of hydrogen iodide on a gold surface at 150 c the following data were obtained: 55x102 912 131 HI], M seconds 0.262 521 Hint: It is not necessary to graph these data. The observed half life for this reaction when the starting concentration is 0.524 M is 0.262 Mis and when the starting concentration is M s The average rate of disappearance of HI from t-o s to t-521 s The average rate of disappearance of H1 from t-521 s to t-782 s s Based on these data, the rate constant for this [ order reaction Ms

Explanation / Answer

1) half life , when initial concentration(a0) = 0.524 M

     t1/2 = 521 sec

half life , when initial concentration(a0) = 0.262 M

     t1/2 = 782-521 = 261 sec

2)average rate of disappearance of HI = (0.262 - 0.524)/(521) = -5*10^-4 M.s-1

3)average rate of disappearance of HI = (0.131 - 0.262)/(782-521) = -5*10^-4 M.s-1

4) by decreasing initial concentration , half life decreasing. so that, itis zero order reaction.

k = x/t

k = 0.262/521= 5*10^-4 M.s-1

Related Questions

Navigate

• Browse (All)
• Browse I
• Subjects

---

---

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