Question

Consider the following plot that shows the fraction of a sample of gas molecules that have a given speed at the same temperature. The gases plotted are H, N2, H70., He. Fraction de molecules Molecular speed (m/s) Which of the following gases in each pair of compounds, Pairs I-III, would show the greater deviation from ideal behavior when both gases are under the same set of conditions? Pair II: water vapor or neon Pair III: hydrogen fluoride and Pair I: argon or xenon fluorine Pair II Pair Pair III

Answer 1

T There are two things that cause gases to deviate from ideal behaviour. The first is the Size of the molecules (the ideal gas law assumes that the actual volume occupied by the atoms. 10 molecules of gas is zedol. The second is the Poesence of any type of interactions between molecules (the law assumes that i molecules or atoms do not interact at all). so in Las xenon is larger than argon- Additionally, It has more eletons, and so it's dispersion forles. w ould be slightly larger than those in argon: So, Xenon will deviate more from ideal behavior In (6) Water molecules, even in the vapor state, will tend to interact with each other with an occasional hydrogen bond-30, H₂0 will deviate much more from ideal behavior than will neon. nr 81 In (C) The HF molecule is the most polar because H-F has the greatest difference in electronegativity. So, they will have stronger intermoleculas forces of attraction Chydrogen bonding) and show a greater deviation from the ideal gas law. 1 Pair I Pair I Water Vapor Pair III hydrogen fluoride Xenon