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clear
//
//
//
//Variable declaration
D0=0.73*10**-4 //diffusion coefficient(m**2/s)
Q=170*10**3 //activation energy(J/mol)
R=8.314
T=873 //temperature(K)
//Calculation
D=D0*exp(-Q/(R*T)) //diffusion(m**2/s)
//Result
printf("\n diffusion is %0.1f *10**-15 m**2/s",D*10**15)
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