The decomposition of hydrogen peroxide follows first order kinetics and has a rate constant of 2.54 x 10-4 s-1 at a certain temperature. if the concentration of hydrogen peroxide is 0.321 m after 855 s , what was the initial concentration of hydrogen peroxide at this temperature? 0.258 m0.399 m0.538 m0.677 m1.48 m

The initial concentration of hydrogen peroxide at the given temperature is 0.399 M

Explanation:

Decomposition of hydrogen peroxide is following first order kinetics.

Rate law expression for first order kinetics is given by the equation:

where,  

k = rate constant =

t = time taken for decay process = 855 s

= initial amount of the reactant = ?

[A] = amount left after decay process =  0.321 M

Putting values in above equation, we get:

Hence, the initial concentration of hydrogen peroxide at the given temperature is 0.399 M