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+clc();

+clear;

+

+// To compute the ammonia diffusing through the stagnant air

+

+x=0.1/12;                            // thickness of still air layer in ft

+T=77+460;                            // temperature in degR

+p=1;                                 // Atmospheric pressure in atm

+pa1=0.3;                             // Pressure of ammonia in still air in atm

+pb1=p-pa1;                           // pressure of air in atm

+pa2=0;                               // pressure of ammonia in the absorption plane

+pb2=p-pa2;                           // pressure of air in absorption plane

+pbm=(pb2-pb1)/(log(pb2/pb1));          // Logarithmic mean pressure

+D=0.914;                             // Diffusion coefficient for ammonia

+R=0.729;                             // Gas constant in ft^3-atm/lb-mole-degR

+N=D*p*(pa1-pa2)/(R*T*x*pbm);

+printf("The amount of ammonia diffusing through the stagnant air is %.1f lb-mol/hr-ft^2",N);
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