(1) The observed half life for this reaction when the starting concentration is
ID: 556973 • Letter: #
Question
(1)
The observed half life for this reaction when the starting concentration is 5.25×10-3 M is s and when the starting concentration is 2.63×10-3 M is___ s.
(2)
The average rate of disappearance of NH3 from t = 0 s to t = 998 s is M s-1.
(3)
The average rate of disappearance of NH3 from t = 998 s to t = 1.50×103 s is M s-1.
(4)
Based on these data, the rate constant for this _______zerofirstsecond order reaction is M s-1.
Explanation / Answer
Q1
half life from 5.25*10^-3 to 2.63*10^-3
t = 998 seconds required
Q2.
average rate of reaciton for NH3
dC/dt = (2.63*10^-3 - 5.25*10^-3)/(998-0) = -0.00000262 M/s
Q3
the rate from 998s to 1.5*103
dC/dt = (Cf-Ci)/(tf-ti) = (1.32*10^-3 - 2.63*10^-3)/(1500-998) = -0.00000260 M/s
Q4
based on this data
the rate will NOT change as concentration changes
therefore, this must be ZERO order
with k = constnat value or
RAte = k
Rate = k = 0.00000260 M/s
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