Heat And Thermodynamics

If the r. m.s speed of chlorine molecule is \(490 \mathrm{~m} / \mathrm{s}\) at \(27^{\circ} \mathrm{C}\), the r. m. s speed of argon molecules at the same temperature will be (Atomic mass of argon \(=39.9 \mathrm{u}\), molecular mass of chlorine \(=70.9 \mathrm{u}\) )