Somebody goes in, and they monitor
the rate at which BrO3 minus
is disappearing and that is what this is
saying, the change in concentration
which respect to time of BrO3
how fast is it disappearing?
It is disappearing at a rate of 1.5 x 10^-2
molarity per second.
And this is at some instance in time, because remember the rate
change is not the same through out the course of the reaction.
And this problem, wants us to say
it is disappearing at this rate, at what rate is
the Br- disappearing.
Well we can come up with a rate expression the Br- disappearing.
Well we can come up with a rate expression
and work this problem.
Now the rate, in terms of
the BrO3 is the change of
concentration of BrO3-
with respect to time
put a minus sign in there, and that would define the rate of the reaction.
Or we could do it in terms of the
Br-. It would be the change in concentration of Br-
with respect to time.
Put a minus sign in there so it is positive
and also put a 5 in there
so they can be equal.
Now they gave me this value, I am going to
put a box around it.
It is 1.5 x 10 ^ -2 molarity per second.