In a study of the decomposition of ammonia on a tungsten surface at 1100 °C the

Question

In a study of the decomposition of ammonia on a tungsten surface at 1100 °C the following data were obtained: 2.64x10-3 441 NH3], M 5.28x10-3 1.32x10-3 6.60x10-4 seconds 662 Hint: It is not necessary to graph these data. The observed half life for this reaction when the starting concentration is 5.28 10Mis concentration is 2.64×10-3 M is s and when the starting The average rate of disappearance of NH3 from t = 0 s to t = 441 s is M s The average rate of dis appearance of NH3 from t441 662 s is Ms-1 s to t Based on these data, the rate constant for this order reaction is

Explanation / Answer

Q1

half life --> tfinal - tinitial = 441 - 0 = 441 seconds

Q2

avg. rate of NH3 ->

dC = (2.64*10^-3)-(5.28*10^-3) = -0.00264

dT = 441

dC/dT = -0.00264 / 441 = -0.00000598 M/s

Q3

avg. rate for 662 and 441

dT = 662-441 = 221

dC = (1.32*10^-3)-(2.64*10^-3) = -0.00132

dC/dT = -0.00132/221

dC/dt = -0.00000597 M/s

Q4

based on this.. rate constant -->

k = 1/(A[0] * half life)

k = 1/((5.28*10^-3)*441) = 0.42946 1/(M-s)

Related Questions

Navigate

• Browse (All)
• Browse I
• Subjects

---

---

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