An adult inhales about 6.0 x 10⁻⁴ m³ of fresh air during a breath. only 20% of fresh air is oxygen. assume the pressure in the lungs is 1.0 x 10⁵ pa and the air is at a temperature of 300 k.
how many oxygen molecules are in each breath?
a. 1.4 x 10²³
b. 2.9 x 10²¹
c. 4.9 x 10⁻⁴
d. 2.9 x 10²⁵

B.

Explanation:

According to avogadro's law, 1 mole of every substance occupies 22.4 L at NTP, weighs equal to the molecular mass and contains avogadro's number of particles.

Given : Volume of fresh air =

volume of oxygen  =

According to the ideal gas equation:

P = Pressure of the gas =  = 0.98 atm

V= Volume of the gas =  

T= Temperature of the gas = 300 K      

R= Gas constant = 0.0821 atmL/K mol

n=  moles of gas= ?

1 mole of oxygen contains = molecules

Thus  of oxygen contain= molecules of oxygen  

Thus there are oxygen molecules in each breath

the answer is c

explanation:

surface mining destroys mountain tops, landscapes, forests and wildlife habitats. on top of that, it leads to soil erosion and destruction of agricultural land. the landscape changes can also disrupt river channels and streams, which leads to flooding. which, can destroy plant life and other animals as well.

explanation: