Consider three 1.0-L flasks at STP. Flask A contains Ar gas, flask B contains O₂ gas, and flask C contains He gas.In which flask do the gas particles have the highest average velocity?

Question

Quizplus · Accepted Answer

The average velocity of a gas particle is directly proportional to the square root of its molar mass. Therefore, the gas particles in flask C (He gas, molar mass of 4.0 g/mol) have the highest average velocity, followed by flask A (Ar gas, molar mass of 40.0 g/mol), and then flask B (O₂ gas, molar mass unknown but likely heavier than He or Ar).

Consider Three 1