clc
//initialisation of variables
hi=143.6 //Btu/lbm
he=53.8 //Btu/lbm
xe=561.1 //Btu/lbm
//CALCULATIONS
Xe=(hi-he)/xe*100//per-cent
//RESULTS
printf('the the quality of the ammonia leaving the expansion value=% f per-cent',Xe)