clear clc T1=273;//in K T2=283;//in K R=8.314;//in J/Kmol alpha1=0.04889;//absorption coefficients in /atm alpha2=0.03802;//absorption coefficients in /atm DelH=(2.303*R*log10(alpha2/alpha1))/((1/T1)-(1/T2));//enthalpy of solution printf('DelH=%.1d J/mol',DelH) //Answer comes negative,error in the textbook //page 118