試題詳解

71. Four identical 1.0 L flasks contain the gases He, Cl₂, CH₄, and NH₃, each at 0 °C and 1 atm pressure. Which of the following statements is true?
(A) He gas has the smallest average kinetic energy.
(B) Cl2 gas has the highest density.
(C) CH4 gas has the greatest number of molecules.
(D) NH3 gas molecules collide elastically.
(E) All gas molecules have same average velocity.