Further Applications of the Ideal-Gas Equation (Section)
Which of the following statements best explains why nitrogen gas at STP is less dense than Xe gas at STP?
(a) Because Xe is a noble gas, there is less tendency for the Xe atoms to repel one another, so they pack more densely in the gaseous state.
(b) Xe atoms have a higher mass than N2 molecules. Because both gases at STP have the same number of molecules per unit volume, the Xe gas must be denser.
(c) The Xe atoms are larger than N2 molecules and thus take up a larger fraction of the space occupied by the gas.
(d) Because the Xe atoms are much more massive than the N2 molecules, they move more slowly and thus exert less upward force on the gas container and make the gas appear denser.
CHEMISTRY CHEM 100002 CH 4 NOTES MOLECULES/COMPOUNDS/CHEMICAL REACTIONS 4.1 Molecules Cause the Behavior of Matter Water does what water molecules do, air does what air molecules do, and humans do what the molecules that compose us do. It is that simple, and it is always true. In all of science history, an exception to this rule has not yet been found. In this chapter, we begin our journey of understanding molecules and how they form the macroscopic substances that we experience every day. 4.2 Chemical Compounds and Formulas Chapter three told us that all matter is composed of atoms. Now we are going to focus on compounds (or mixt