4. Which of the following statements is true concerning ideal gases?
(A) the temperature of the gas sample is directly related to the average velocity of the gas particles
(B) at STP, 1.0 L of Ar(g) contains about twice the number of atoms as 1.0 L of Ne(8) because the molar mass of Ar is about twice that of Ne
(C) a gas exerts pressure as a result of the collisions of the gas molecules with the walls of the container
(D) the gas particles in a sample exert attraction on one another
(E) all of these statements are false