Air enters in the lungs in a tiny cavity called alveoli. Oxygen diffuses into our blood from alveoli. The average radius of alveoli is 0.005 cm and air inside it contains 21% `O_(2)` and 79% `N_(2)`. Assuming that the pressure in the aveoli is 1 atm at body temperature of `37^(@)C`.
Number of `N_(2)` molecules in one alveoli is :
A. `9.8 xx 10^(13)`
B. `9.8 xx 10^(12)`
C. `9.8 xx 10^(14)`
D. `9.8 xx 10^(15)`
