A gas mixture with 3.00 mol of Ar, x moles of Ne, and y moles of Xe is prepared at a pre...

A gas mixture with 3.00 mol of Ar, x moles of Ne, and y moles of Xe is prepared at a pressure of 1 bar and a temperature of 298 K. The total number of moles in the mixture is four times that of Ar. Write an expression for in terms of x. At what value x does have its minimum value? Calculate for this value of x.