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S

  • one year ago

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)

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

  2. S
    • one year ago
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    somehow this answer didn't work for me

  3. aaronq
    • one year ago
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    did you convert 2.7 hours to minutes?

  4. S
    • one year ago
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    162 min, right?

  5. aaronq
    • one year ago
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    i got 0.0474 ...0.05 M

  6. S
    • one year ago
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    Worked ! probably i did something wrong in calculations. Did you use the same formula ?

  7. aaronq
    • one year ago
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    yep, i did

  8. S
    • one year ago
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    Thank you!

  9. aaronq
    • one year ago
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    no prob!

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