For an Undergraduate Research Project, a student needs to detect a 0.1 ppm N2 impurity in Ar gas. If the density of Ar gas is 1.85 g/liter and it contains 0.1 ppm N2, find the amount of N2 (in grams) that is available in a liter of this gas. Determine the concentration of the N2 in moles/liter. Given MW of N2 = 28.02 g/mol.