1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Easy kinectics

  1. Jun 17, 2009 #1
    We examine the reaction A B which displays first-order kinetics. We know that k = 0.30 / min.
    If we begin with [A] = 0.54 M what will be after exactly 7.00 minutes?


    hey i used the formula In[A]/[Ao]=-kt then rearranged to In[A]=-kt+[InAo]
    when i sub it in i get In[A]=-0.3x7+In[0.54] and i get the answer 0.066 however the answer is 0.47M. i tired converting to second and still didnt work. any help would be good. thanks
     
  2. jcsd
  3. Jun 17, 2009 #2

    cepheid

    User Avatar
    Staff Emeritus
    Science Advisor
    Gold Member

    There's nothing wrong with your math.* The amount of [A] left is 0.066. The question is not asking you for the amount of [A] left. It is asking you for the amount of produced.

    *Well, other than the fact that it is supposed to be Ln, not In. Natural Logarithm.
     
  4. Jun 17, 2009 #3
    ta, how do i work out how much is produced?
     
  5. Jun 17, 2009 #4
    dw, im stupit. thanks mate
     
  6. Jun 17, 2009 #5

    cepheid

    User Avatar
    Staff Emeritus
    Science Advisor
    Gold Member

    A is being converted to B in this chemical reaction, right? If 0.066 is left, what happened to the rest of it? It became B.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Easy kinectics
  1. Easy chem (Replies: 2)

  2. Easy calculation (Replies: 9)

  3. Chem Easy question (Replies: 4)

Loading...