Use the graph to calculate the instantaneous rate of formation of HBr at 50 s Express your answer using one significant figure.

The instantaneous rate of formation of HBr at 50 s is

Explanation:

From the graph,

Initial rate of the = 1.0 M

Time when the concentration of is 0.5 M (half the concentration ) = 60 sec

For first order reaction:

Calculating rate constant for first order reaction using half life:

.....(1)

= half life period = 60 s

k = rate constant = ?

Putting values in equation 1:

For the given chemical reaction:

Rate of the reaction =

Negative sign represents the disappearance of the reactants

From the above expression:

At 50 seconds,

Plugging values in above expression, we get:

Hence, the instantaneous rate of formation of HBr at 50 s is