Quantcast

Got Homework?

Connect with other students for help. It's a free community.

  • across
    MIT Grad Student
    Online now
  • laura*
    Helped 1,000 students
    Online now
  • Hero
    College Math Guru
    Online now

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

S

In the first order reaction A-. products [A]= 0.826M initially and 0.634 M after 15.0 min. What will [A] be after 2.7 h? ( t1/2= 39.3 min)

  • one year ago
  • one year ago

  • This Question is Closed
  1. aaronq
    Best Response
    You've already chosen the best response.
    Medals 1

    find the decay constant, k: \[t _{1/2}=\frac{ \ln2 }{ k }\] then use the exponential decay formula: \[A=A _{0}e ^{-kt}\]

    • one year ago
  2. S
    Best Response
    You've already chosen the best response.
    Medals 0

    somehow this answer didn't work for me

    • one year ago
  3. aaronq
    Best Response
    You've already chosen the best response.
    Medals 1

    did you convert 2.7 hours to minutes?

    • one year ago
  4. S
    Best Response
    You've already chosen the best response.
    Medals 0

    162 min, right?

    • one year ago
  5. aaronq
    Best Response
    You've already chosen the best response.
    Medals 1

    i got 0.0474 ...0.05 M

    • one year ago
  6. S
    Best Response
    You've already chosen the best response.
    Medals 0

    Worked ! probably i did something wrong in calculations. Did you use the same formula ?

    • one year ago
  7. aaronq
    Best Response
    You've already chosen the best response.
    Medals 1

    yep, i did

    • one year ago
  8. S
    Best Response
    You've already chosen the best response.
    Medals 0

    Thank you!

    • one year ago
  9. aaronq
    Best Response
    You've already chosen the best response.
    Medals 1

    no prob!

    • one year ago
    • Attachments:

See more questions >>>

Your question is ready. Sign up for free to start getting answers.

spraguer (Moderator)
5 → View Detailed Profile

is replying to Can someone tell me what button the professor is hitting...

23

  • Teamwork 19 Teammate
  • Problem Solving 19 Hero
  • You have blocked this person.
  • ✔ You're a fan Checking fan status...

Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.

This is the testimonial you wrote.
You haven't written a testimonial for Owlfred.