Question

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)

Answer 1

find the decay constant, k:

\[t _{1/2}=\frac{ \ln2 }{ k }\]


then use the exponential decay formula:

\[A=A _{0}e ^{-kt}\]

Answer 2

somehow this answer didn't work for me

Answer 3

did you convert 2.7 hours to minutes?

Answer 4

162 min, right?

Answer 5

i got 0.0474 ...0.05 M

Answer 6

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

Answer 7

yep, i did

Answer 8

Thank you!

Answer 9

no prob!