According to kinetic-molecular theory, in which of the following gases will the root-mean-square speed of the molecules be the highest at 200 °C? A)NH₃ B)N₂O C)O₂ D)UF₆ E)None. The molecules of all gases have the same root-mean-square speed at any given temperature.

Question

Quizplus · Accepted Answer

The root-mean-square speed of gas molecules is inversely proportional to the square root of the molar mass. NH₃ has the lowest molar mass among the given gases, so it will have the highest root-mean-square speed at the same temperature.

According to Kinetic-Molecular Theory, in Which of the Following Gases