Calculate the temperature (°C) wherein the mean speed of F₂ molecules is the same as a private jet traveling at 650 mph.  

Identify which would have a greater mean speed: an F1 car moving at 230 mph or CH₄(g) molecules at 120°C.

Explain how the following changes affect the v_rms of a gas:

(a) increasing pressure
(b) decreasing volume
(c) decreasing temperature

Calculate the ratio between the v_rms of Xe and N₂ at 273 K.