# Rate lawWatch

#1
I need some help with some questions regarding kinetics

1) (a) Write the rate law for the following reaction using x, y, and z for the order of the individual components:

5Br- (aq) + BrO3- (aq)+ 6H+ (aq)  3Br2 (l) + 3H2O (l)

(b) Determine the individual orders and overall order using the following
experimental data:

Br- (aq) (M) BrO3- (aq) (M) H+ (aq) (M) Rate (M/s)
0.33 0.33 0.33 4.3x10-4
0.33 0.66 0.33 4.3x10-4
0.33 0.66 0.66 1.7x10-3
1.32 0.66 0.66 6.8x10-3

Order of Br- (aq) = 1st

Order of BrO3- (aq) = 2nd

Order of H+ (aq) = 2nd

Overall order = 5th order

Is this correct?

(c) What are the units of k for this reaction?
0
10 years ago
#2
for part A it would simply be

and from the data youve given it looks like is 0th order
is 2nd order
and
is 1st order

have another look and compare experiments 1+2

and the units of k will be

so

0
#3
Cheers mate, appreciate that
0
10 years ago
#4
signature update needed..... Atletico Madrid 4 Barcelona 2
0
#5
(Original post by charco)
signature update needed..... Atletico Madrid 4 Barcelona 2
I highlighted that game in which the quote came from, nice try.
0
#6
(Original post by thelostchild)
for part A it would simply be

and from the data youve given it looks like is 0th order
is 2nd order
and
is 1st order

have another look and compare experiments 1+2

and the units of k will be

so

By the way is the integrated rate law for a 1st order reaction this

ln([A]0) - ln([A]) = kt or this, rate = k[A]0 = k[A] ?
0
10 years ago
#7
(Original post by Barca)
By the way is the integrated rate law for a 1st order reaction this

ln([A]0) - ln([A]) = kt or this, rate = k[A]0 = k[A] ?
it would be the first one, you have the differential equation

which when integrated gives the exponential decay

which like you said would rearrange to

theres a table on wikipedia which summerises it nicely
http://en.wikipedia.org/wiki/Rate_eq...C_1.2C_2_and_n
0
#8
Thanks for that
0
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