RMS speed question?
(a) What is the rms speed of a Helium atom in Helium gas at STP?
(b) What temperature would oxygen gas have if the rms speed of its atoms was the same as in part (a)?
- NCSLv 73 years agoFavorite Answer
STP temperature is 0 ºC = 273 K
Vrms = √(3RT / M)
(a) Vrms = √(3 * 8.314J/mol·K * 273K / 0.004kg/mol) = 1305 m/s
(b) Oxygen gas is diatomic, 32 g/mol, so
Vrms = √(3 * 8.314J/mol·K * 273K / 0.032kg/mol) = 461 m/s
Hope this helps!