Cheung, Anthony – Exam 3 – Due: Nov 8 2006, 1:00 pm – Inst: McCord3010(part 1 of 1) 10 pointsYouweregiventhevalues0.2107, 2.253, 3.392,and 17.58 as the van der Waals parameterafor the gases CO2, CH3CN, Ne, and CH4butNOT the correspondence of the values to thecompounds. Whatavalue shoud be assignedto CO2?1.Unable to determine2.0.2107 L2·atm/mol3.2.253 L2·atm/mol4.17.58 L2·atm/mol5.3.392 L2·atm/molcorrectExplanation:Since the van der Waals parameterarep-resents the role of attractions, it will becomelarger as the strength of the intermolecularattractions increases.Acetonitrile is polar and would be expectedto have the strongest intermolecular forcesand the highest value ofa.The three non-polar species can be rankedin order of the polarizability of their elec-tron clouds. Carbon dioxide has the largest,most polarizable electron cloud, so it shouldhave the strongest London dispersion forcesof these three species and the highest value ofaafter acetonitrile. Methane would be next,
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Intermolecular force, Van der Waals force, Van der Waals, intermolecular