How many half-lives will it take for the concentration of the n2o to reach 30 % of its original concentration?

Number of lives required to reach 30% of the its original concentration is 2.

Explanation:

Number of half lives are calculated by using formula :

       ............(1)

where,

a = amount of reactant left after n-half lives

= Initial amount of the reactant

n = number of half lives

Here we have:

Initial concentration of nitrogen dioxide =

Concentration of nitrogen dioxide after n number of half lives = a

a = 30% of x :

n = 1.736 ≈ 2

Number of lives required to reach 30% of the its original concentration is 2.

i think it is true since you can test the answer and can use observations to complete it.

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