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.

why is cellular respiration important for homeostasis?

it changes food into energy that the organism can use.

which of the following is most likely to happen if a cell is not able to divide?

the cell will not be replaced when it is damaged.

explanation:

plants need sunlight, water, and carbon dioxide to make food. plants use the raw materials of water, nutrients they absorb from soil, and carbon dioxide to make sugars the plant can use. energy from the sun and chlorophyll are also needed.