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//ques-18.5
//Calculating standard heat of formation of actylene
clc
h1=-1300;//heat of combustion of acetylene (in kJ)
h2=-395;//heat of combustion of graphite(C) (in kJ)
h3=-286;//heat of combustion of hydrogen (in kJ)
H=2*h2+h3-h1;//heat of formation of actylene (in kJ)
printf("Heat of formation of actylene is %d kJ/mol.",H);
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