General_Sax
Jan22-10, 01:00 AM
1. The problem statement, all variables and given/known data
A first-order reaction is 17% complete after 30 min. How long after the start of the reaction will the reaction be 80% complete?
2. Relevant equations
ln[A] = ln[A0] - kt
3. The attempt at a solution
[A] = 0.83
[Ao] = 1.0
t = 30 min
k = ln(1/0.83) / 30 = 0.006211 min-1
t = ln(1.0/0.2) / 0.006211 = 259 min
This problem is on a practice exam for my upcoming midterm.
I'm not sure about my choices for [A].
When the reaction is completed the [A] = 0, is that right?
ie, [A] starts at 1.0 -- [A0] in this problem -- and goes to 0, right?
1. The problem statement, all variables and given/known data
2. Relevant equations
3. The attempt at a solution
A first-order reaction is 17% complete after 30 min. How long after the start of the reaction will the reaction be 80% complete?
2. Relevant equations
ln[A] = ln[A0] - kt
3. The attempt at a solution
[A] = 0.83
[Ao] = 1.0
t = 30 min
k = ln(1/0.83) / 30 = 0.006211 min-1
t = ln(1.0/0.2) / 0.006211 = 259 min
This problem is on a practice exam for my upcoming midterm.
I'm not sure about my choices for [A].
When the reaction is completed the [A] = 0, is that right?
ie, [A] starts at 1.0 -- [A0] in this problem -- and goes to 0, right?
1. The problem statement, all variables and given/known data
2. Relevant equations
3. The attempt at a solution