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+//scilab 5.4.1

+clear;

+clc;

+printf("\t\t\tProblem Number 7.2\n\n\n");

+// Chapter 7 : Mixtures Of Ideal Gases

+// Problem 7.2  (page no. 323) 

+// Solution

+

+//For Gaseous Freon-12 (CCl2F2)

+//MW of air=29 & MW of freon-12=120.9

+//initial pressure in tank is atmospheric pressure that is 14.7 psia

+//final pressure of tank is 1000 psia

+//The partial pressure of the Freon-12 is 1000-14.7

+printf("The partial pressure of the Freon-12 is %f\n",1000-14.7)

+//the mole fraction of air=the initial pressure / final pressure

+printf("The mole fraction of air is %f\n",14.7/1000)

+//the mole fraction of freon=the partial pressure of freon / the final pressure

+printf("The mole fraction of Freon-12 is %f\n",(1000-14.7)/1000)

+MWm=((14.7/1000)*29) + (((1000-14.7)/1000)*120.9);//the molecular weight of mixture=sum of products of mole fraction of each gas component 

+printf("The molecular weight of the mixture is %f",MWm);