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.