Question

The density of an unknown gas is measured to be 1.63 g/L at 1 atm and 27 °C. What could be the molecular formula for the gas? Ο Ο Ο Ο Ο

Answer 1

Let, the total mass of the gas is m molecular weight of the gas is m and no y moles of the gas is a So I'm = nx M - (1) Again we know, PV = nRT here, P = pressure = 1 atm V = volume molt no no of mole R= universal you constant = 0.082 Lakmk T= temperature - 27 = (27 + 273k = 300 K - 1X V = n x 0.082 x 300 or v = nx 24.6 - (ii) Again, dan here, D-density = 1.63 g/l m= mass v= volume m D = a nx 24.6 [from equation (ii) 7 or 3 M ] or, 1.63 = MXM ( from equation nx 24.6 M = (1.63 x 24.6) g/mol - 40.098 almol F 40 g/mol

only Ar have molecular weight Among belows five gon 40 g/mol tence, the you will be Ar [3rd option is right here]