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//Calculate the number of oxygen molecules
//Example 2.1
clc;
clear;
r=0.0050;.......//radius of alveoli in cm
P=1;........//Pressure in atm
R=0.08206;.......//Gas Constant in L atm K^-1 mol^-1
T=310;.......//Temperature in Kelvin
mp=14;........//Mole Percent of Oxygen
V=(4/3)*%pi*r^3*10^-3;........//Volume of one alveolus in Litres
n=(P*V)/(R*T);..........//Number of moles of air in one alveolus in mol
Na=6.022*10^23;.....//Avagadro's Number
N=n*(mp/100)*Na;.......//Number of Oxygen Molecules
printf("The number of oxygen molecules = %.1f*10^12 Oxygen molecules",N*10^-12);
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