A chemlcal englneer Is studying the rate of this reaction. Use this graph to ans

Question

A chemlcal englneer Is studying the rate of this reaction. Use this graph to answer the following questlons: He fills a reaction vessel with N,Os and measures its concentration as the reaction proceeds What is the half life of the reaction? Round yuur nswer to 2 significant digits. Suppose the rate of the reaction is known to be fist order in N,Os. Calculate the value of the rate constant k 0.8 Round your nswe' to 2 significant digits. Also be sure you include the correct unit symbol Prodict the concentration of N in vessel after 2.10 seconds have passed. Assume no other rcaction is important, and continue to assume the rate is first order in N O Round your answer to 2 significant digits 02 (seconds)

Explanation / Answer

¡)

Answer

Half life = 0.30seconds

Explanation

Initial Concentration = 1M

Half life is the time required to reduce the concentration to 1/2 of its original concentration

Half concentration is 0.5M

time corresponding to 0.5M is 0.3seconds in graph

ii)

Answer

2.31s^-1

Explantion

For first order reaction

t1/2= 0.693/k

k = 0.693/t1/2

   = 0.693/0.3s

= 2.31s^-1

iii)

For first order reaction

ln[A]t= -kt + ln[A]0

where,

[A]0 = Initial concentration, 1M

k = rate constant , 2.31s^-1

t = time, 2.10s

[A]t= Concentration at time t

ln[A]t = -2.31s^-1 × 2.10s + ln(1)

2.303log[A]t = -4.851 + 2.303log(1)

log[A]t= -4.851/2.303

= -2.106

[A]t= 1×10^-2.106

= 0.0078M

  

  

Related Questions

Navigate

• Browse (All)
• Browse A
• Subjects

---

---

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