Calculate the mean free path of air molecules at 3.50 * 10-13 atm and 300 k. (this pressure is readily attainable in the laboratory; see exercise 18.23.) as in example 1

The mean free path can be defined as the average distance between collisions for gas molecules. It can be calculated using the formula:

∧ = ---------(1)

Given :

T = 300 K

P = 3.50 * 10-13 atm = 3.55 * 10^-8 pascals

d = diameter of air molecules = 2* radius of air molecules

                                                 = 2* 2*10^-10 m = 4*10^-10 m

k = Boltzmann constant = 1.38 * 10^-23 J/K

Na = avogadro's number = 6.023 * 10^23

Substituting in equation(1) we get:

∧ = 1.38 *10^-23* 300/√2*π*(4*10^-10)²*3.55*10^-8

  = 1.641*10^5 m

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.