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.

each chemical family is represented as a group or column on the periodic table. based on chemical properties, there are 6 types of chemical families. group 1 represents alkali metals, group 2 represents alkaline earth metals, groups 3 to 12 represent transition metals, groups 13 to 16 represent non-metals and other metals, group 17 represents halogens and group 18 represents noble gases.