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+//ques-18.27
+//Finding partial pressure of hydrogen at which free energy change is zero
+clc
+G=-10.1;//free energy change (in kJ/mol)
+T=500;//temperature (in K)
+p1=10;//partial pressure of HI (in atm)
+p2=0.001;//partial pressure of I2 (in atm)
+//On solving, log10(K) = (-G)/(2.303*8.314*T)
+K=11.36;
+p3=(p1/(K*sqrt(p2)))^2;
+printf("The partial pressure of hydrogen is %.0f atm.",p3);