A sample containing 3.25 moles of He is mixed with 2.25 moles of Ne and 1.75 moles of Ar. All components are at 1 bar and 350 K. Calculate ∆mixG.

Answer : The value of is, -22.5 kJ

Explanation :

The formula used for is:

where,

n = number of moles = 3.25 +2.25 + 1.75 = 7.25 moles

R = gas constant = 8.314 J/mole.K

T = temperature = 350 K

X = mole fraction

First we have to calculate the mole fraction of He, Ne and Ar.

and,

and,

Now we have to calculate the value of .

Thus, the value of is, -22.5 kJ