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+clear;

+clc;

+printf("\t\t\tProblem Number 6.21\n\n\n");

+// Chapter 6: The Ideal Gas

+// Problem 6.21 (page no. 264) 

+// Solution

+

+//data

+T2=100+273; //Celsius temperature converted to Kelvin //final temperature

+T1=20+273; //Celsius temperature converted to Kelvin //initial temperature

+cv=0.7186; //specific heat at constant volume //kJ/kg*K

+//Now,

+deltas=cv*log(T2/T1); //change in entropy //Unit:kJ/kg*K

+//For 0.2 kg,

+deltaS=(0.2)*deltas; //The change in enthalpy in kJ/K

+printf("For 0.2 kg of air,The change in enthalpy is %f kJ/K\n",deltaS);