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//Variable Declaration
R = 8.314 //Ideal Gas Constant, J/(mol.K)
T = 298 //Temperature of Gas, K
M = 0.044 //Molecular wt of CO2, kg/mol
P = 101325 //Pressure, N/m2
NA = 6.022e23 //Number of particles per mol
sigm = 5.2e-19 //m2
//Calculations
zCO2 = (P*NA/(R*T))*sigm*sqrt(2)*sqrt(8*R*T/(%pi*M))
//Results
printf("\n Single particle collisional frequency is %4.1e per s",zCO2)
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