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+clc

+clear

+//Input data

+Ta=150;//The presence of Theoretical air

+

+//Calculations

+hfc=-393.52;//The enthalpy of formation for carbondioxide in MJ/kmol

+hfh=-285.8;//The enthalpy of formation for water in MJ/kmol

+hfon=0;//The enthalpy of formation for oxygen and nitrogen gas 

+hfch=-74.87;//The enthalpy of formation for methane in MJ/kmol

+HP=[hfc]+[2*hfh];//The total enthalpy on the products side in MJ/kmol

+HR=1*hfch;//The total enthalpy on the reactants side in MJ/kmol

+H=HP-HR;//The total change in enthalpy of reactants and products in MJ/kmol

+np=2;//Number of moles of product

+nr=4;//Number of moles of reactant

+n=np-nr;//The difference in moles

+R=8.314*10^-3;//Universal gas constant 

+t=298;//The temperature in K

+U1=H-[n*R*t];//The standard internal energy in MJ/kmol

+hfh1=-241.82;//The enthalpy of formation for water in MJ/kmol

+HP1=[1*hfc]+[2*hfh1];//The total enthalpy on the products side in MJ/kmol

+H1=HP1-HR;//The change in enthalpy for reactants and products in MJ/kmol

+np1=4;//Number of moles of product

+nr1=4;//Number of moles of reactant

+n1=np1-nr1;//The difference in moles

+U2=H1-[n1*R*t];//The standard internal energy in MJ/kmol

+

+//Output

+printf(' (a)The water as liquid , \n    The standard enthalpy of combustion is  %3.2f MJ/kmol \n    The standard internal energy of combustion is  %3.2f MJ/kmol \n (b)The water as a gas , \n    The standard enthalpy of combustion is  %3.2f MJ/kmol \n    The standard internal energy of combustion is  %3.2f MJ/kmol ',H,U1,H1,U2)