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//Example number 3.14, Page number 51
clc;clear;
close;
//Variable declaration
Ev=68*10**3; //enthalpy(j/mol)
R=8.314;
T1=300; //temperature(K)
T2=800; //temperature(K)
//Calculation
x1=-Ev/(R*T1);
x2=-Ev/(R*T2);
n=%e**(x1)/%e**(x2); //ratio of number of vacancies
//Result
printf("ratio of number of vacancies is %.2e",n)
//answer in the book varies due to rounding off errors
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